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Onion

Allium cepa
Also known as: Garden Onion, Common Onion, Bulb Onion

Onion is a vegetable in the Amaryllidaceae family. It grows best in full sun with medium moisture, and is listed for USDA zones 5-10. Plants reach harvest about 51–184 days after planting and sit about 4 inches apart.

Varieties

61 from High Mowing, True Leaf Market & Seeds Now · sorted by days to maturity
  • Mini Purplette51–69 days

    Early mini onion; Glossy purple skin; 1-1.5” bulbs

    Early maturing, mini purple onions that can be harvested baby as scallions or left to mature into gorgeous purple pearls. Excellent field holding quality with glossy skin and sweetness that maintains into maturity. Great raw in salads and perfect for pickling. Best when grown at 40 degrees latitude and higher.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Barletta60–69 days

    Heirloom; Non-GMO; Vegetable; Annual

    60-69 Days to maturity. Allium cepa. Barletta Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, small, white, round-bulbing pearl type, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Barletta onions are an Italian cocktail heirloom onion variety that offers smooth, round 0.75-inch bulbs. They are also known as Barletta Baby Pearl Onions, Pearl Onions, or Cocktail Onions. The small white bulbs are often harvested early to make pickled onions. In addition, the bulbs can be harvested for use in soups, sauces, and kabobs. ~9,000 seeds/oz.

    View on True Leaf Market
  • Red Baron60–65 days

    Deep red coloration; Excellent succession crop

    Beautiful deep red scallions with royal purple inner rings and bright, sweet flavor. Harvest at 12-15" in length, just before the bulb begins to swell. Performs well when planted in clumps of 4-5; succession planting is recommended. Provides delicious flavor when cooked, pickled and in raw preparations.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Yellow Cipollini68–92 days

    Long day; Stores 2-3 months; 3-4” bulbs

    Flattened yellow onion with great flavor. Exceptionally strong flavor that sweetens with cooking. Great for grilling, roasting and pickling. Small bulbs won’t store for more than a few months but are so delicious that you won’t need them to.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Southport White Globe 40470–110 days

    Heirloom; Vegetable; Annual

    70-110 Days to maturity. Allium cepa. Southport White Globe Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. Southport Onion produces medium size white globe-shaped onions. They are firm and pungent onions great for cooking, imparting a nice strong onion flavor to your favorite recipes. 9,000/ounce.

    View on True Leaf Market
  • Candy Hybrid72–98 days

    Vegetable; Annual

    Resistance: HR: Pink Root Rot

    85 Days to maturity. Allium cepa ‘Candy’. Candy Onion Seeds. Non-GMO, annual, hybrid, bulbing, intermediate-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. Resistant to Pink Root Rot. The Candy Hybrid onion combines the qualities of a short-day and long-day onion. These onions can be grown all over the country. Candy Hybrid Onions have a mild and sweet taste. They are perfect for cooking because they produce large bulbs with thick rings. They are reliable and popular because they are relatively pest-free and take only 85 days to become ready to harvest. Approx. 5,700 seeds/oz.

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  • Barletta, Pearly White75–80 days

    Can tolerate hot temperatures; Direct sow; Grows well in full sun; Grows well with containers; Grows well with raised beds; Matures in <90 days; Start indoors; Super easy to grow

    The Barletta, Pearly White Onion is an extremely tasty small pearl-sized onion - Barletta onions are beautiful silver white pickling onions - So delicious - Perfect for shish-ka-bobs, chicken and veggie skewers, and even just grilled on the bbq - Grows well in containers and small spaces - Easy to grow Days to Maturity | 75-80 day Onion Seeds | Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows. Click here for complete Onion grow guide

    Growing notes: Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows.

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  • Red Cipollini76–104 days

    Heirloom; Vegetable; Annual; open-pollinated; long-day

    90 Days to maturity. Allium cepa. Red Cipollini Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. Red Cipollini is bright red, flattened, and can be used for fresh eating, boiling, or braising. Red Cipollini is about 3-4 inches across and about 1-1 .5 inches in depth. Approx. 8,400 Seeds per ounce.

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  • Crystal White Wax81–109 days

    Heirloom; Non-GMO; Container; Vegetable; Biennial (grown as Annual)

    Resistance: HR: Pink Root Rot

    95 Days to maturity. Allium cepa. Crystal White Wax Onion Seeds. Non-GMO, annual, perennial, organic, hybrid, open-pollinated, heirloom, AAS winner, heat tolerant, cold tolerant, drought tolerant, bulbing, bunching, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Resistant to Pink Root Rot. This pearl onion variety can be used as a pickling onion or a bunching onion. Rounded flattened bulbs are small and very popular for their mild flavor and early production. As a short-day variety, these heirloom seeds work best in southern gardens. ~ 6,800 seeds/oz.

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  • Amber82–110 days

    Long day; Early maturing; 3-4” bulbs

    Exceptionally uniform, open-pollinated yellow onion that is early maturing and has a gorgeous, globe shape. Onion tops are clean and vigorous, making this an excellent variety for fresh sales. When plants mature, leaves drop uniformly, allowing for easy assessment of harvest timing. Bulb skins cure to a beautiful yellowish brown and onions remain firm in long term storage. An outstanding performer in our trials fields. From our partners at Sativa Seeds.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • New York Early83–113 days

    Long to intermediate day; Stores well; 3-4” bulbs

    An early and dependable yellow onion selected to store until spring. Medium sized round bulbs with attractive warm-brown skin and white flesh, mild enough to eat raw all winter. Milder and more tender than most yellow onions, but equally reliable in storage. Developed for direct seeding in the rich muck soils of Orange County, NY; further improved by Johnny’s Selected Seeds. Gladstone Walla Walla Valencia Ailsa Craig Onions Allium cepa

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Red Burgundy85–115 days

    Heirloom / Open Pollinated; Vegetable; Annual; Container

    100 Days to maturity. Allium cepa. Red Burgundy Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Red Burgundy Onions produce a 3- 4 inch globe with dark red skin. This red onion variety is a short-day type and does better in southern gardens. Red Burgundy is great to eat fresh out of the garden due to the fact it does not store well. The flattened globes with off-white flesh and red rings are particularly mild and sweet. Approx. 8,000 seeds/oz.

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  • Ruby85–115 days

    Heirloom; Container; Vegetable; Annual; open-pollinated; cold tolerant; long-day

    100 Days to maturity. Allium cepa. Ruby Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Ruby has a wonderful burgundy color and a deeply globed shape. It was released sometime around 1965 and is appreciated for its high yields. ~8,400 seeds/oz.

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  • Stuttgarter (Organic)85–115 days

    Heirloom; Organic; Vegetable; Annual

    100 Days to maturity. Allium cepa. Organic Stuttgarter Onion Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. AKA: Giant Stuttgart, Stoccarde. Produces slightly flat globes with bronze skin and white flesh. Approx 9,555 seeds per ounce.

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  • Ailsa Craig89–121 days

    Long day; Large 5-6” bulbs

    Large Spanish onion with delicious, sweet flavor, perfect for burgers and salads. Huge bulbs are mild, sweet and firm with light golden skins. Small necks allow for longer storage than other Spanish-types; stores up to two months. Named for a perfectly round, solid rock island off the coast of Scotland.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Cabernet F189–121 days

    Late intermediate day; Stores 2-4 months; 3-4” bulbs

    The earliest red storage onion in our trials with lovely, uniform burgundy bulbs. Medium sized bulbs with very nice internal color plus a stroke of brilliance: stems flop down without crimping before maturity, allowing continued growth while preventing disease from reaching the bulb. Stores well, but is also beautiful bunched for fresh market sales. Widely adapted for both size and earliness.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Cortland F189–121 days

    Long day; Stores well; 3-4” bulbs

    Resistance: IR: Pink Root

    Thick copper skin, fine necks and uniform round shape; the standard for organic growers. From the breeders of Copra F1 and Prince F1, Cortland F1 is considered an improvement based on its wider adaptability to many conditions and long storage life. This solid variety comes from our partners at Bejo Seeds.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Red Geneva89–121 days

    Long day; Stores 4-5 months; 2.5-3.5” bulbs

    An attractive, red Cipollini-type with excellent flavor. Flattened bulbs pair well with Yellow Cipollini. Slower to mature than yellow varieties, but with similar shape and size. Stores longer than Yellow Cipollini. Excellent flavor for eating raw or cooking.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Borettana Yellow Cipollini90–120 days

    Heirloom; Container; Vegetable; Annual

    Resistance: HR: Pink Root Rot

    Allium cepa Borettana Yellow Cipollini is an Italian heirloom short-day onion, biennial but grown as an annual, producing small, flat, button-shaped bulbs about 3-4 inches wide and 1 inch thick with golden-yellow skin and sweet, mild flesh. Favored for roasting, grilling, and caramelizing, the bulbs also store well. Suited to garden plots, raised beds, containers, and greenhouses, maturing in about 90-120 days.

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  • Monastrell F190–122 days

    Intermediate day; Excellent interior color; Stores well; 4-5" bulbs

    Beautiful, uniform bulbs with slightly flattened shape and strong, resistant tops. A great, mid season onion that performs well in many latitudes. Good storage with bright, sweet flavor when used fresh. Strong tops stand up well to thrips pressure and foliar diseases. From our partners at Vitalis Organic Seeds..

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • OG WALLA WALLA (Long Day)90–125 days

    Quick Overview ORGANIC For generations this variety has been the pride of Washington State's onion producing region. This famous Northwest gourmet sweet onion can be grown from seed. In long and intermediate day areas where temperatures do not drop below -10 degrees. They can be planted between August 15th and September 1st and overwintered under a light mulch for harvest the following late June or early July. For colder areas it's best to raise seedlings and set out transplants in early to mid April. Not a storage onion. How to Plant Bulb Onions Onion bulbs are quite hardy and can withstand 20° F frost. They should be set out 4-6 weeks prior to the last expected frost. When your plants arrive they should appear to be quite dry. DO NOT WET THEM NOR STICK THEIR ROOTS IN WATER. Unpack them and store them in a cool, dry place until it is time to plant. They should last about 3 weeks kept this way. Do not worry that your plants seem dry. They will "shoot" new roots and new, green tops as soon as they are planted. Be sure to specify on your order when you want your plants to arrive.

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  • Powell F192–124 days

    UP; Long day; 3” bulbs

    Resistance: HR: Downy Mildew · IR: Pink Root

    Productive, hard yellow onion with large bulbs, strong skin and improved long-term storage. Improved downy mildew resistance, high yields and excellent field holding capacity make this an ideal variety for commercial production. Replacement for Yankee F1. From our partners at Bejo Seeds.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Sedona F192–124 days

    Long day; Stores well; 3-4” bulbs

    Resistance: HR: Pink Root · IR: Basal Rot

    Spanish globe variety produces large bulbs with attractive, rosy-brown skins. A standout in our trials for several years, Sedona F1 is noted for high yields and long storage potential. This heat-tolerant variety also performs well in the Northeast.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Red Creole93–127 days

    Heirloom; Container; Vegetable; Annual

    Resistance: HR: Pink Root

    110 Days to maturity. Allium cepa. Red Creole Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Resistant to Pint Root Rot. The red creole onion was developed in 1962 by the Desert Seed Company in California. This red onion is know for its storage ability and quick production in the South. Red creole has a flavor that is not quite as sweet as some red onions, but is spicy and excellent for cooking. Approx. 8,400 Seeds per ounce.

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  • Red Torpedo93–127 days

    Heirloom; Vegetable; Annual; open-pollinated; intermediate-day

    110 Days to maturity. Allium cepa. Red Torpedo Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, bulbing, intermediate-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. A fantastic onion variety from a small Mediterranean town in Italia. Red Torpedos are long, red-purple, spindle-shaped onions with a mild, sweet flesh. Remember to enjoy them soon as sweet onions are poor keepers. ~ 8,400 seeds/oz.

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  • Texas 1015 Super Sweet93–127 days

    Heirloom; Container; Vegetable; Annual

    110 Days to maturity. Allium cepa. Texas 1015 Super Sweet Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. The Texas 1015 onion was developed by the legendary Dr. Leonard Pike of Texas A&M University. Its name derives from the planting date in Texas (October 15). The Texas 1015 is considered a Short Day onion, but many times it takes longer for bulbs to develop, so it can be used in Intermediate and Long Day areas. Has been successfully grown from Mexico to Ohio. ~# seeds/oz.

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  • Texas Grano 502 (Organic)93–127 days

    Heirloom; Organic; Container; Vegetable; Annual

    Resistance: HR: Pink Root Rot

    110 Days to maturity. Allium cepa. Organic Texas Grano 502 Onion Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, cold tolerant, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Resistant to Pink Root Rot. A milder-tasting onion that grows best in the southern USA climes, preferring a warmer growing season. Stores for 2 to 3 months when hung properly. Developed by Texas A&M in 1944, this variety produces large yellow-skinned globes with white flesh. ~7,000 seeds per ounce.

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  • Calibra F194–126 days

    Long to intermediate day; Stores well; 3-4” bulbs

    Resistance: IR: Pink Root

    Spanish cross with delicious, mild flavor that sweetens in storage. Round, hard globes with a slight shoulder, attractive reddish skins and thin necks that dry down well. Sweet like Candy F1 with less juiciness and smaller size, more suitable for storage; superior quality and flavor in March in our storage trials.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Gladstone94–126 days

    Intermediate day; 4-5” bulbs

    Resistance: IR: Pink Root

    A widely adapted, fresh market white onion for growers in the northern and middle regions of the country. Dark green foliage, great for bunching. Medium to large bulbs resist greening and are mildly sweet with very firm flesh. Moderate storage potential; some susceptibility to smudge. From our partners at Bejo Seeds.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Rossa di Milano94–126 days

    Long to intermediate day; Stores well; 4” bulbs

    Specialty onion with sweet flavor, good yield and long storage potential. The moment we saw it in our trials, with high shoulders and shimmering pink skins, it stole our hearts. Broad onions with a rounded, tapering heart shape. Plants are very productive and store well. A standout open-pollinated variety.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Talon F194–126 days

    Long day; Stores well; 3-4” bulbs

    Resistance: IR: Pink Root

    Stunning round storage bulbs with pretty, golden skin and a beautiful clean white interior. Rock-hard globes are uniformly sized. Very impressive in our trials with a great stand and tops that remained as healthy as Yankee F1, which is noted for its downy mildew tolerance. From our partners at Bejo Seeds.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Walla Walla94–126 days

    Intermediate day; Large 6” bulbs

    The famous Walla Walla onion selected for increased uniformity and disease resistance. Improved variety produces large round bulbs, upright tops and necks that dry down well. Held out against disease far longer than other open-pollinated onions in our trials. While unavailable for 2024, we know how important this variety is and are working to find an organic grower to take on seed production. Commercial growers outside the Walla Walla Valley, please visit sweetonions.org/marketing-order for more information. Unavailable in 2024

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Dakota Tears95–129 days

    Long day; Bulbs up to 1 lb; Stores well; 3” bulbs

    Medium-sized, hard round bulbs with very attractive reddish-gold tint. Continuously selected for vigor, size, storability, disease and insect resistance. A great open-pollinated variety from breeder David Podoll, Dakota Tears was honored as one of Organic Gardening magazine’s ten outstanding varieties in their 2010 trials.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

    View on High Mowing
  • Red Grano95–129 days

    Heirloom; Container; Vegetable; Annual

    112 Days to maturity. Allium cepa. Red Grano Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Red Grano onion produces medium-sized red onions that are crisp and mild flavored. Top shaped. Perfect for salads or hamburgers. A short-day variety suitable for Southern regions. Approx. 8,400 Seeds per ounce.

    View on True Leaf Market
  • Red Carpet F199–133 days

    Long day; Great storage; 3-4” bulbs

    Resistance: IR: Pink Root

    Magnificent magenta interior rings make this an especially gorgeous red onion. Tight bulbs that store extremely well with the excellent color on the interior layers unique to our partners at Bejo Seeds. Red Carpet F1 is 2-3 days earlier than Red Wing F1, while maintaining 98% the same size, with a more rounded shoulder.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • Early White Grano PRR100–110 days

    Heirloom; Vegetable; Annual

    Resistance: HR: Pink Root Rot

    100-110 Days to maturity. Allium cepa. Early White Grano PRR Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. Resistant to Pink Root Rot. Cultivated and bred by the Texas AM Agricultural Experimental Station, Early White Grano PRR onion seeds are a sweet, white cultivar of the famous Texas Early Grano 502. This large Vidalia-style onion has been bred for its tolerance to PRR or Pink Root Rot which is known to heavily affect onions. May be grown in short or intermediate-day regions. ~7,000 seeds per ounce.

    View on True Leaf Market
  • Ebenezer, White100–120 days

    Quick Overview Medium sized, flat, onion with thin, unnoticeable translucent white skin with less waste when prepared. Fine, grained flesh, popular for pickling. Excellent keeper. They are technically long day onions. However, they can be grown anywhere, down south they will be more grown like big scallions. How to Plant Bulb Onions Onion bulbs are quite hardy and can withstand 20° F frost. They should be set out 4-6 weeks prior to the last expected frost. When your plants arrive they should appear to be quite dry. DO NOT WET THEM NOR STICK THEIR ROOTS IN WATER. Unpack them and store them in a cool, dry place until it is time to plant. They should last about 3 weeks kept this way. Do not worry that your plants seem dry. They will "shoot" new roots and new, green tops as soon as they are planted.

    View on Seeds Now
  • Eclipse L303100–160 days

    Heirloom; Non-GMO; Vegetable; Annual

    100-160 Days to maturity. Allium cepa. Eclipse L303 Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. Produce crisp, medium-size white onions with a mild flavor that's perfect for cooking and using in soups, stews, and entrees, as well as eating fresh in salads or on burgers. Eclipse L303 onions are well-adapted to growing in the South. Can also be grown in long-day regions to produce mini or pearl-size onions. 9,000 seeds per ounce.

    View on True Leaf Market
  • OG Borettana Cipollini (Long Day)100–110 days

    Quick Overview A great storage onion that has made the Italian onions famous. A long day variety that is small and flat with a yellow-brown skin. An excellent, unique flavor that can be added to any dish. ORGANIC How to Plant Bulb Onions Onion bulbs are quite hardy and can withstand 20° F frost. They should be set out 4-6 weeks prior to the last expected frost. When your plants arrive they should appear to be quite dry. DO NOT WET THEM NOR STICK THEIR ROOTS IN WATER. Unpack them and store them in a cool, dry place until it is time to plant. They should last about 3 weeks kept this way. Do not worry that your plants seem dry. They will "shoot" new roots and new, green tops as soon as they are planted. Be sure to specify on your order when you want your plants to arrive.

    View on Seeds Now
  • Onion Transplants (Long Day) - OG Sweet Spanish, Yellow *pre-order*100–115 days

    Quick Overview An extremely long storing yellow onion. Larger size than most, better uniformity, and higher yield potential. Medium-large, blocky bulbs with dark yellow skin and thin necks that dry quickly. ORGANIC • Long day • Keeps well when stored • Great flavor and beautiful color How to Plant Bulb Onions Onion bulbs are quite hardy and can withstand 20° F frost. They should be set out 4-6 weeks prior to the last expected frost. When your plants arrive they should appear to be quite dry. DO NOT WET THEM NOR STICK THEIR ROOTS IN WATER. Unpack them and store them in a cool, dry place until it is time to plant. They should last about 3 weeks kept this way. Do not worry that your plants seem dry. They will "shoot" new roots and new, green tops as soon as they are planted.

    View on Seeds Now
  • Red Long of Florence100–130 days

    Long day; Fresh bunching; 4-6” long bulbs

    Gorgeous bottle-shaped bulbs with brilliant red coloring. Slender bulbs with healthy green tops make a stunning bunch. Days to maturity are from transplant and are for fresh harvest, as Red Long of Florence does not dry well in the field and will not store. Preferred by culinary enthusiasts for easy kitchen prep and long, uniform bulbs. Mild, sweet flavor is great for pickling and using raw in salads.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

    View on High Mowing
  • Rock, Red (Intermediate Day)100–120 days

    Quick Overview Red rock is a beautiful red heirloom intermediate day onion. It has a consistent red color throughout, with a medium-to-large bulb size that is slightly flat on top. • Intermediate Day • Organic • Heirloom • Crisp, mild flavor How to Plant Bulb Onions Onion bulbs are quite hardy and can withstand 20° F frost. They should be set out 4-6 weeks prior to the last expected frost. When your plants arrive they should appear to be quite dry. DO NOT WET THEM NOR STICK THEIR ROOTS IN WATER. Unpack them and store them in a cool, dry place until it is time to plant. They should last about 3 weeks kept this way. Do not worry that your plants seem dry. They will "shoot" new roots and new, green tops as soon as they are planted.

    View on Seeds Now
  • Rock, Yellow100–120 days

    Quick Overview Bronze yellow skin, mild, and sweet. Plant them close together if you want fast growing scallions. They are technically long day onions. However, they can be grown anywhere, down south they will be more grown like big scallions. How to Plant Bulb Onions Onion bulbs are quite hardy and can withstand 20° F frost. They should be set out 4-6 weeks prior to the last expected frost. When your plants arrive they should appear to be quite dry. DO NOT WET THEM NOR STICK THEIR ROOTS IN WATER. Unpack them and store them in a cool, dry place until it is time to plant. They should last about 3 weeks kept this way. Do not worry that your plants seem dry. They will "shoot" new roots and new, green tops as soon as they are planted.

    View on Seeds Now
  • Southport Red Globe100–120 days

    Heirloom; Container; Vegetable; Annual; cold tolerant

    Resistance: HR: Fusarium

    100-120 Days to maturity. Allium cepa. Southport Red Globe Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Southport Red Globe Onion is best known for its storage abilities. This high-yielding red onion produces large and firm bulbs that are great for salads or cooking. The bulbs are glossy purple-red with a flavor that isn't too spicy. Resistant to fusarium. Established in 1873, this red onion is a great choice for northern gardens as it is a long-day type. Approx. 8,000 seeds/oz.

    View on True Leaf Market
  • Grano, Red (Short Day)102–138 days

    Can tolerate hot temperatures; Direct sow; Grows well in full sun; Grows well with containers; Grows well with raised beds; Start indoors; Super easy to grow

    Red Grano onions are medium-sized red onions - A perfect variety for slicing and canning - A crisp and mild flavored onion - Short day onion Days to Maturity | 120 days Onion Seeds | Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows. Click here for complete Onion grow guide

    Growing notes: Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows.

    View on Seeds Now
  • Grano, White (Short Day)102–138 days

    Can tolerate hot temperatures; Direct sow; Grows well in full sun; Grows well with containers; Grows well with raised beds; Start indoors; Super easy to grow

    White Grano onions are medium-sized white onions - A perfect variety for slicing and canning - A crisp and mild flavored onion - Short day onion Days to Maturity | 120 days Onion Seeds | Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows. Click here for complete Onion grow guide

    Growing notes: Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows.

    View on Seeds Now
  • Southport, Red Globe (Long Day)102–138 days

    Can tolerate hot temperatures; Direct sow; Grows well in full sun; Grows well with containers; Grows well with raised beds; Start indoors; Super easy to grow

    Southport Red Globe is a long-day onion that produces medium to large, deep red, globe-shaped bulbs with crisp, mildly pungent flesh. A reliable storage onion, it is well suited to northern gardens and matures in about 110-120 days. Plant onions 1/4 inch deep and thin to give the bulbs room to size up.

    Growing notes: Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows.

    View on Seeds Now
  • Southport, White Globe (Long Day)102–138 days

    Can tolerate hot temperatures; Direct sow; Grows well in full sun; Grows well with containers; Grows well with raised beds; Start indoors; Super easy to grow

    The Southport Onion produces medium-sized white globe onions - A crisp and mild-flavored onion - Perfect for salads and many other culinary creations - A long day onion - Grows well in containers and small spaces - Easy to grow Days to Maturity | 120 days Onion Seeds | Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows. Click here for complete Onion grow guide

    Growing notes: Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows.

    View on Seeds Now
  • Valencia102–138 days

    Day neutral; 4” bulbs

    Versatile, day-neutral sweet Spanish onion for all regions. Mild to sweet flavor. Excellent for bunching when young or for fresh market sales of large bulbs with warm golden-brown skin. Stores moderately well.

    Growing notes: Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Onions are cool-season biennials dependent on day length for bulb formation. Short day onions start forming bulbs with 11-12 hrs of daylight, long day onions need 14-16 hrs, intermediate day onions fall in between. Start transplants indoors 8-12 weeks before last frost. Optimal soil temp for germination is 75-85°F. When seedlings reach 5”, trim to increase girth. Onions compete poorly with weeds and steady water is important. Harvest sweet and red onions after bulb development, and storage onions after tops dry up and flop over. Cure for 3-5 days in the field if weather is dry or indoors for 2 weeks at 75-80°F and 80% relative humidity. Store at 33-35°F at 65-70% relative humidity.

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  • White Sweet Spanish102–138 days

    Heirloom; Container; Vegetable; Annual

    120 Days to maturity. Allium cepa. White Sweet Spanish Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. These large onion bulbs are considered a long-day type but also do well in intermediate-day regions. Large, sweet, mild, and can be stored for a moderate amount of time. The White Spanish Onion is comparable to the Yellow Spanish Onion but has less sharpness. More suited for northern gardens but is a great option for southern gardens in the fall. Approx. 8,000 seeds/oz.

    View on True Leaf Market
  • OG Blanco Duro (Long Day)110–135 days

    Quick Overview Blanco Duro is a medium sized onion with pungent firm flesh. Good storage onion and tolerant to pink root disease. How to Plant Bulb Onions Onion bulbs are quite hardy and can withstand 20° F frost. They should be set out 4-6 weeks prior to the last expected frost. When your plants arrive they should appear to be quite dry. DO NOT WET THEM NOR STICK THEIR ROOTS IN WATER. Unpack them and store them in a cool, dry place until it is time to plant. They should last about 3 weeks kept this way. Do not worry that your plants seem dry. They will "shoot" new roots and new, green tops as soon as they are planted. Be sure to specify on your order when you want your plants to arrive.

    View on Seeds Now
  • Onion Transplants (Long Day) - OG Ruby, Red *pre-order*110–125 days

    Quick Overview A long day variety that is small and flat with a ruby red skin. An excellent, unique flavor that can be added to any dish. Sure to be your new favorite! ORGANIC How to Plant Bulb Onions Onion bulbs are quite hardy and can withstand 20° F frost. They should be set out 4-6 weeks prior to the last expected frost. When your plants arrive they should appear to be quite dry. DO NOT WET THEM NOR STICK THEIR ROOTS IN WATER. Unpack them and store them in a cool, dry place until it is time to plant. They should last about 3 weeks kept this way. Do not worry that your plants seem dry. They will "shoot" new roots and new, green tops as soon as they are planted. Be sure to specify on your order when you want your plants to arrive.

    View on Seeds Now
  • Red Burgundy (Short Day)110–120 days

    Can tolerate hot temperatures; Direct sow; Grows well in full sun; Grows well with containers; Grows well with raised beds; Start indoors; Super easy to grow

    The Red Burgundy onion plant produces beautiful 4" wide red onions - Short day - These onions have a mild but very sweet flavor - Excellent slicing variety Days to Maturity | 110-120 days Onion Seeds | Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows. Click here for complete Onion grow guide

    Growing notes: Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows.

    View on Seeds Now
  • Spanish Sweet, White (Long Day)110–120 days

    Can tolerate hot temperatures; Direct sow; Grows well in full sun; Grows well with containers; Grows well with raised beds; Start indoors; Super easy to grow

    The White Sweet Spanish variety will produces a globed shaped white onion - Long day - This is one of the most popular white onion varieties available - Easy to grow - Perfect for beginners - Grows well in containers and tight spaces Days to Maturity | 110-120 days Onion Seeds | Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows. Click here for complete Onion grow guide

    Growing notes: Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows.

    View on Seeds Now
  • Utah Yellow Sweet Spanish110–115 days

    Heirloom; Vegetable; Annual; Container; cold tolerant

    Resistance: IR: Pink Root

    110-115 Days to maturity. Allium cepa. Utah Yellow Sweet Spanish Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. This yellow onion is considered a long-day type and may be grown in intermediate-day regions as well. Recommended by Utah State University and is the state vegetable of Utah. Large bulbs weighing over a pound have great storage capabilities. This Spanish Onion is relatively easy to grow with moderate pink root tolerance. ~7,000 seeds per ounce.

    View on True Leaf Market
  • Walla Walla Sweet (Long Day)110–120 days

    Can tolerate hot temperatures; Direct sow; Grows well in full sun; Grows well with containers; Grows well with raised beds; Start indoors; Super easy to grow

    The Walla Walla Sweet Onion variety will produces a globed shaped white onion - Bulbs can reach 2 lbs - This is one of the most popular Long day onion varieties available - Easy to grow - Perfect for beginners - Grows well in containers and tight spaces Days to Maturity | 110-120 days Onion Seeds | Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows. Click here for complete Onion grow guide

    Growing notes: Onions are easy to grow, have a fairly short growing period and take up little space in the garden. Plant onions 1/4 inch deep and 3 to 4 inches apart in double rows, leaving 6 to 10 inches between rows.

    View on Seeds Now
  • Wethersfield, Red110–125 days

    Quick Overview Large globe with very thin, reddish-purple colored skin. The white flesh is very firm and tinged with pink or purple highlights. Fine strong flavor, vigorous. They are technically long day onions. However, they can be grown anywhere, down south they will be more grown like big scallions. How to Plant Bulb Onions Onion bulbs are quite hardy and can withstand 20° F frost. They should be set out 4-6 weeks prior to the last expected frost. When your plants arrive they should appear to be quite dry. DO NOT WET THEM NOR STICK THEIR ROOTS IN WATER. Unpack them and store them in a cool, dry place until it is time to plant. They should last about 3 weeks kept this way. Do not worry that your plants seem dry. They will "shoot" new roots and new, green tops as soon as they are planted.

    View on Seeds Now
  • Yellow Granex PRR Hybrid110–160 days

    Container; Vegetable; Annual

    Resistance: HR: Pink Root Rot

    110-160 Days to maturity. Allium cepa. Yellow Granex PRR Onion Seeds. Non-GMO, annual, hybrid, cold tolerant, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Resistant to Pink Root Rot. Also known as the Vidalia onion or Georgia Sweet onion, the Yellow Granex hybrid onion is one of the sweetest onions you can grow. As a sweet onion variety, the Granex Yellow hybrid is not a good choice for long-term storage. ~ 9,000 seeds/oz.

    View on True Leaf Market
  • Imai Early Yellow127–173 days

    Heirloom; Vegetable; Annual

    150 days maturity after transplanting. Allium cepa. Imai Early Yellow Onion Seeds. Non-GMO, cool-season, annual, heirloom. This selection of Senshu Yellow matures 10-15 days earlier than original Imai. A medium-day length, over-wintering variety, it does best in Zones 5 and 6. Maturing to over 8 ounces, the large, yellow-skinned, thick, flat globe bulbs are crisp and mild. Utilize any part of this plant for its onion flavor. Bulb begins to flatten at 13-hour day length. ~ 7,500 seeds / oz.

    View on True Leaf Market
  • Shonan Red136–184 days

    Heirloom; Vegetable; Annual

    160 Days to maturity. Allium cepa. Shonan Red Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, intermediate-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. The name Shonan comes from a region in Kanagawa Prefecture. The onion has excellent flavor with a crisp, sweet, mild pungency that makes it excellent for salads. Utilize any part of this plant for its onion flavor. ~ 8,500 seeds / oz.

    View on True Leaf Market
  • Superex Yellow Hybrid136–184 days

    Vegetable; Annual

    160 Days to maturity. Allium cepa. Superex Yellow Onion Seeds. Non-GMO, annual, hybrid, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. Resistant to disorders. Alt names bawang besar, bawang bombay, hom yao, piyaz, rata lunu, sibuyas, tama negi, tsung tau, yang cong. This short-day hybrid is good for tropical or sub-tropical areas. The flattened globe has yellow/brown skin and a mild, sweet flavor. Approx. 7,500 seeds / oz.

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Family
Amaryllidaceae
Category
Vegetable
Form
Bulb
Lifecycle
annual
Zone
5-10
Height
1–3 ft
Spread
0.25–2 ft
Sun
Full sun

Plant spacing

9 plants per square footSquare-foot planting diagram: a 1-foot square divided into a 3-by-3 grid holding 9 onion plants spaced 4 inches apart.
9 plants per square foot

In a square-foot bed, space onion about 4 in apart — that fits 9 plants in each 1-foot square (3×3). Wider rows or containers space the same.

Water
Medium

Plan your onion planting

Add onion to a free GardenDraft plan and get sow, transplant, and harvest dates computed for your ZIP code — with a drag-and-drop bed layout and reminders when it’s time to plant.

Start your free plan →

At a glance

Days to harvest
51–184 days
From transplant or sow to first harvest
Harvest style
Harvest once
One main harvest
After harvest
Stores well
Holds (or improves) after peak
Frost tolerance
Semi-hardy · to ~24°F
Lowest temperature the foliage usually survives
Germination
~70%
Typical minimum germination rate

Storing & preserving

Stores well in the right conditions. Cure 2–3 weeks, then store cool, dark, and dry — keeps for months.

  • Cure & store: Dry the necks/skins fully, then store in a cool pantry.
  • Freeze: Freeze chopped for cooking (texture softens).

General home-preservation guidance — for tested processing times and safety, follow the National Center for Home Food Preservation.

Growing timeline

When to plant and harvest onionPlanting timeline for onion, relative to last frost: start indoors from 16 weeks before last frost to 4 weeks before last frost; grow from 4 weeks before last frost to 3 weeks after last frost; harvest from 3 weeks after last frost to 22 weeks after last frost.Start indoorsGrowHarvestLast frostTransplant
Start onion indoors ~12 weeks before transplanting 4 weeks before last frost; first harvest 3 weeks after last frost.
Seed to transplant
56-84 days
Outdoor planting
-28 to -7 days vs frost
Propagation
Seed
Schedule anchor
Last Frost

Companion planting — with cited sources

From US/Canada cooperative-extension publications and peer-reviewed studies. Evidence-tier dots show how strongly each recommendation is backed: ●●● peer-reviewed mechanism · ●● extension consensus · traditional knowledge with a plausible mechanism.

Pairs well with (24)

  • Black WalnutEvidence tier B: Extension consensus across multiple US/Canada land-grant institutionsjuglone-tolerant

    Onion and other alliums are juglone-tolerant; listed as 'safe under walnut' in extension tables.

    Source: Penn State Extension, S8

  • CarrotEvidence tier B: Extension consensus across multiple US/Canada land-grant institutionspest-deter

    Onions emit sulfur-containing volatiles (allyl sulfides) that interfere with host-finding behavior of carrot rust fly (Psila rosae), the principal carrot pest in cool-temperate North America. Reciprocally, carrot foliage volatiles disrupt onion fly (Delia antiqua) host-finding by a similar olfactory-masking mechanism. Multiple US/Canada extension stations recommend perimeter or alternating-row onion/carrot intercropping for both crops.

    Region: Effect strongest in maritime / cool-summer regions with high carrot rust fly pressure (Pacific Northwest, Great Lakes, Maritimes, New England).

    Source: S1, UC IPM, S4, University of Guelph / OMAFRA

  • ParsnipEvidence tier B: Extension consensus across multiple US/Canada land-grant institutionspest-deter

    Parsnip is susceptible to the same carrot rust fly (Psila rosae) that attacks carrot; the allium-volatile masking mechanism applies equally to parsnip. Long parsnip season (often 120+ days) makes a perimeter allium row especially useful.

    Region: Maritime and Great Lakes regions where carrot rust fly is severe.

    Source: S1, University of Guelph / OMAFRA

  • ArugulaEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Allium volatiles partial deterrent for flea beetle and aphids on arugula; shared brassica / allium rationale.

    Source: University of Maryland Extension

  • Asian GreensEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Same brassica / allium rationale as common cabbage.

    Source: University of Maryland Extension

  • Bok ChoyEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Same brassica / allium rationale; see common cabbage.

    Source: University of Maryland Extension

  • BroccoliEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Same brassica/allium rationale; see common cabbage.

    Source: University of Maryland Extension, S13

  • Brussels SproutsEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Same brassica / allium pairing rationale as common cabbage. Long brussels sprout season (often 90-120+ days) makes companion alliums particularly practical.

    Source: University of Maryland Extension, S13

  • Chinese CabbageEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Same brassica / allium rationale; see common cabbage.

    Source: University of Maryland Extension

  • CollardsEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Same brassica/allium rationale; see common cabbage.

    Source: University of Maryland Extension, S13

  • Common BeetEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Onion and beet are traditional bedfellows in extension home-garden guides; onion volatiles plausibly mask beet from leafminer flies, though direct trials are limited. Spatial use of bed is the main practical benefit.

    Source: S1, University of Maryland Extension

  • Common CabbageEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Onion volatiles are widely cited as a partial deterrent for cabbage maggot (Delia radicum) and brassica aphids; extension sources note the practice but acknowledge mixed results. The non-competing rooting depth (shallow onion vs. taproot brassica) supports interplanting.

    Source: S5, University of Maryland Extension, S13

  • Common KaleEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Allium volatiles cited as partial deterrent to cabbage aphid and cabbage maggot. See common cabbage for complete relationships.

    Source: University of Maryland Extension, S13

  • Common LettuceEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Onion's shallow roots and short canopy do not compete with lettuce, and onion volatiles are reported to reduce aphid colonization on adjacent leafy greens. Cited consistently in extension home-garden guides although controlled trials are scarce.

    Source: University of Maryland Extension, S13

  • Common SpinachEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Allium volatiles may mask spinach from leafminer flies; widely recommended in extension home-garden guides though direct evidence is limited.

    Source: University of Maryland Extension

  • Hamburg ParsleyEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Like parsnip and carrot, Hamburg parsley is susceptible to carrot rust fly attacking the storage root; allium-volatile masking provides modest protection.

    Source: S1, S13

  • KohlrabiEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Same brassica/allium pairing rationale; see common cabbage.

    Source: University of Maryland Extension, S13

  • Romanesco Broccoli / CauliflowerEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Allium volatiles partial deterrent to cabbage maggot and aphids. See common cabbage for full discussion.

    Source: University of Maryland Extension, S13

  • RutabagaEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Allium volatiles cited by extension references as a partial deterrent to cabbage maggot (Delia radicum), the principal rutabaga and turnip pest. Shares the Brassica oleracea companion profile in broad strokes; see common cabbage for complete relationships.

    Source: University of Maryland Extension, S13

  • Siberian KaleEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Shares the broad brassica / allium pairing rationale; see common cabbage for full discussion. Siberian kale is more cold-hardy than B. oleracea kale and is often overwintered, extending the allium-companion window.

    Source: S13

  • StrawberryEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Onion is traditionally listed as a strawberry companion with the rationale that allium volatiles deter aphids and some foliar disease vectors; empirical support is weak but the practice is cited by multiple extension home-garden references.

    Source: University of Maryland Extension

  • Summer SavoryEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Summer savory is recommended near onions in extension home-garden guides; plausible volatile masking effect against onion thrips and onion maggot fly.

    Source: University of Maryland Extension

  • Swiss ChardEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Allium-chard pairings appear in Northeast extension home-garden guides on the same rationale as beet-onion: alliums may mask leafminer host cues; primary benefit is bed efficiency.

    Source: University of Maryland Extension

  • TurnipEvidence tier C: Traditional practice with plausible mechanism but limited empirical replicationpest-deter

    Allium volatiles cited as partial cabbage maggot deterrent; particularly relevant for root brassicas like turnip where maggot damage destroys the marketable yield.

    Source: University of Maryland Extension, S13

Sources cited

S1
Cornell University Cooperative Extension — vegetable production guides
S13
University of New Hampshire Extension
S23
University of Guelph / OMAFRA (Ontario)
S3
UC IPM (University of California Agriculture and Natural Resources)
S4
Oregon State University Extension Service
S5
Michigan State University Extension
S6
Penn State Extension
S8
Iowa State University Extension and Outreach
S9
University of Maryland Extension — Home & Garden Info Center

Care & troubleshooting— extension-sourced, with citations

When to feed, prune & water

Feed alliums in spring

Feeding
  • Routine careFeed nitrogen every 3 weeks during active growth· every 3 wks · ~9 wksmoderate evidence — extension confidence

    Alliums build the bulb from spring leaf growth. Feed a nitrogen source every ~3 weeks through spring, then stop once bulbs start to swell so they cure well.

    Source: UMN Extension

Stop watering and cure onions for storage

Care
  • Routine careStop watering once tops fallstrong evidence — extension confidence

    When about half the tops have bent over and bulbs reach full size, stop watering and let the necks begin to dry. Harvest when roughly half to three-quarters of the tops have fallen.

    Source: UMN Extension; Clemson HGIC

  • Routine careCure in a warm airy spotstrong evidence — extension confidence

    Dry the pulled bulbs in a warm, well-ventilated, shaded place for two to four weeks until the outer scales are papery and the necks are tight, then store cool and dry. Proper curing keeps rot organisms out during storage.

    Source: UMN Extension; Clemson HGIC

Floating row cover timing

Protection

Unusual this time of year.

Something looks wrong?

Describe what you see on your onionand we'll rank the likely causes — most likely first, least-invasive fix first.

Bacterial soft rot

Diseasesevere

Symptoms: mushy water-soaked decay of fleshy tissue; slimy soft rot of heads, bulbs, roots, or fruit; foul odor from rotting tissue; rapid collapse after wounding or in warm wet conditions; rot spreading in storage

  • CulturalRemove rotting plants and produce (manage, not cure)strong evidence — extension confidence

    Soft rot can't be cured once tissue breaks down; promptly remove and discard affected plants and produce so the bacteria don't spread to neighbors or other stored vegetables.

    Source: Cornell NYS IPM

  • CulturalAvoid wounds and excess moisturestrong evidence — extension confidence

    Harvest in dry conditions, handle gently to avoid bruising, control insects that create entry wounds, and improve drainage; cure and store bulbs and roots cool and dry.

    Source: Cornell NYS IPM

  • CulturalDon't overwater and rotatemoderate evidence — extension confidence

    Avoid waterlogged soil and overhead watering that splashes bacteria, and rotate away from previously affected fleshy crops to lower disease pressure.

    Source: Cornell NYS IPM

Botrytis Neck Rot (Onion, storage)

Diseasesevere

Symptoms: softening at the neck of stored bulbs; sunken water-soaked neck tissue turning gray-brown; gray fuzzy mold between scales; bulbs rotting 1-2 months into storage

  • CulturalCure bulbs thoroughly before storagestrong evidence — extension confidence

    Harvest at maturity and cure until necks are fully dry, since the fungus cannot penetrate a dry neck; this latent disease shows up only in storage, so prevention is essential.

    Source: USU Extension; UC IPM

  • CulturalStop late nitrogen and store cool and drystrong evidence — extension confidence

    Withhold nitrogen once bulbing begins and store cured bulbs cold (about 33-34F) with good airflow and 70-75% humidity to suppress rot.

    Source: USU Extension; UMass Extension

Onion & garlic white rot

Diseasesevere

Symptoms: yellowing and dieback of leaves; plants pull up easily; fluffy white mold at the base and on bulbs; tiny black poppy-seed sclerotia in the rot; spreads in patches in cool moist soil

Leafhoppers & aster yellows

Diseasemoderate

Symptoms: small wedge-shaped insects hop from leaves; stippled or yellowed foliage; with aster yellows: yellow stunted growth, witches-broom of thin shoots, deformed bitter carrots

Leek moth and thrips on leeks

Pestmoderate

Symptoms: whitish windowpane streaks or mottling on leaves (thrips); pale winding mines and holes in leaves; caterpillars tunneling in leaves and stems; distorted rotting foliage from secondary infection

  • CulturalCover and clean upmoderate evidence — extension confidence

    Cover plants with insect netting or row cover at planting to keep egg-laying leek moths and thrips off, and remove and destroy badly infested leaves and crop debris. Rotate alliums to a new spot each year to break the pest cycle.

    Source: RHS: Leek moth; RHS: Thrips on Garden Plants

  • OrganicWash off thrips or spray· every 1 wkmoderate evidence — extension confidence

    For thrips, hose plants down to dislodge them, or apply a labeled insecticidal soap or neem product per the label. For leek moth caterpillars, a labeled spinosad or Bacillus thuringiensis product applied per the label when young larvae are active can help.

    Always follow the product label — it is the law.

    Source: RHS: Leek moth; RHS: Thrips on Garden Plants

Leek rust

Diseasemoderate

Symptoms: bright orange raised pustules on leaves; yellowing around the spots; heavily infected leaves drying and dying back; reduced size of usable shank

  • CulturalImprove airflow and remove infected leavesmoderate evidence — extension confidence

    Leek rust is a fungal disease favored by damp, crowded conditions and lush growth; space plants well, avoid over-feeding with nitrogen, and remove badly affected leaves. Mild cases usually still produce a usable crop, and rotating alliums each year helps prevent buildup.

    Source: RHS: Leek rust; UMN Extension: Growing leeks

Onion Smut

Diseasemoderate

Symptoms: dark blackish blisters/streaks on cotyledons and young leaves with a silvery sheen; thickened down-curled seedling leaves; blisters rupturing to release black spore powder; seedling death within weeks

  • CulturalUse transplants and long rotations in infested soilstrong evidence — extension confidence

    In infested soil set out transplants rather than direct-seeding (onions are only susceptible during germination/emergence) and rotate 3+ years to non-hosts such as corn or small grains.

    Source: Bugwood/HPIPM; Univ. of Wisconsin Extension

  • ChemicalPlant fungicide-treated seedmoderate evidence — extension confidence

    Where seeding into possibly infested soil, plant only fungicide-treated seed to protect the vulnerable seedling stage, per the label.

    Always follow the product label — it is the law.

    Source: Bugwood/HPIPM; CSU Extension

Onion thrips

Pestmoderate

Symptoms: silvery streaks and flecks on leaves; tiny slivers that scatter when disturbed; worst in hot dry weather

  • CulturalOverhead-water and remove debris· every 3 days · ~3 wksmoderate evidence — extension confidence

    Thrips dislike moisture; overhead irrigation and weed/debris cleanup reduce them. Reflective mulch deters them on young plants.

    Source: UMN Extension

  • OrganicInsecticidal soap/spinosad - label use only· every 1 wk · ~3 wksmoderate evidence — extension confidence

    For heavy pressure a labeled soap or spinosad on a weekly schedule helps. Follow the label.

    Always follow the product label — it is the law.

    Source: UMN Extension

Purple blotch and botrytis leaf blight on onion

Diseasemoderate

Symptoms: small white or tan spots on leaves enlarging into purple lesions with yellow margins; lesions girdling and collapsing leaves; tip dieback; worse in warm humid weather or after thrips damage

  • CulturalRotate, manage moisture, and ease off nitrogenstrong evidence — extension confidence

    Use a three to four year rotation, plant on well-drained raised beds with good spacing, and avoid prolonged leaf wetness. Skip heavy late-season nitrogen and manage thrips, since their feeding wounds open the door to infection.

    Source: NC State Extension; UC IPM Onion and Garlic

  • ChemicalApply a protectant fungicide if needed· every 10 daysmoderate evidence — extension confidence

    If lesions spread under warm humid conditions, apply a labeled protectant fungicide per the label, starting early and repeating while weather favors disease.

    Always follow the product label — it is the law.

    Source: NC State Extension; UC IPM Onion and Garlic

Cabbage & onion root maggots

Pestmoderate

Unusual this time of year.

Symptoms: young brassica or onion transplants wilt and stunt; bluish off-color leaves; white legless maggots in roots; rotting tunneled roots; plants pull up easily

Onion and garlic downy mildew

Diseasemoderate

Unusual this time of year.

Symptoms: fine furry grayish-white growth on older leaves when humid; pale or yellowing patches on leaves; leaves dying back from the tips; lesions later turning purplish; worst in cool wet weather

  • CulturalRotate, space, and use clean stockstrong evidence — extension confidence

    Rotate at least three years away from alliums, plant disease-free sets and cloves, and space rows for airflow so leaves dry quickly. Avoid overhead watering during cool humid spells and remove infected leaves.

    Source: UC IPM Onion and Garlic; NC State Extension

  • ChemicalApply a fungicide under wet conditions· every 10 daysmoderate evidence — extension confidence

    Where the disease recurs and weather stays cool and wet, apply a labeled fungicide preventively per the label before symptoms become widespread.

    Always follow the product label — it is the law.

    Source: UC IPM Onion and Garlic

Onion bolting

Disorderlow

Unusual this time of year.

Symptoms: a stiff flower stalk shooting up from the center; round flower head forming; thick hard neck; small bulbs that store poorly; bolting after a cold spell

  • CulturalSnap off stalks and use bolted bulbs firststrong evidence — extension confidence

    Bolting is triggered by a prolonged cold period after good growth, especially in large transplants. Remove the flower stalks as they appear and eat those bulbs soon, since they will not store. Next year plant smaller sets (under an inch) and avoid setting out oversized transplants too early.

    Source: Clemson HGIC; RHS