How to Grow Kale: The Green That Keeps Giving

GardenDraft Team · July 3, 2026 · Updated August 1, 2026 · 8 min read

Part of: Garden Planning Guides · How to Grow Vegetables — Crop Guides A–Z

Kale earned its reputation honestly: it's about as tough and forgiving as a leafy green gets. It shrugs off cold that flattens other crops, produces for months from a single planting, and actually tastes better after a frost. If you want one green that keeps giving from spring deep into winter, this is it.

A cool-season crop that loves frost

Kale is a brassica, a cousin of broccoli and cabbage, and like them it's built for cool weather. It grows in spring and summer, but it comes into its own in fall: a light frost converts some of the leaf's starch to sugar, so kale harvested after the first cold snaps is noticeably sweeter and less bitter. In mild regions, well-mulched kale can stand and be picked right through winter — one of the few crops that does.

How much cold it stands depends on type: the catalog rates kale hardy to 10–20°F, with curly types at the tough end of the range. Under a layer of snow — which insulates — plants often come through colder nights than that and resume producing in a thaw.

Pick your kale type

All kales grow the same way, so choose by leaf and kitchen use. Curly kale is the classic ruffled type, the cold-hardiest and the most productive over a long season. Lacinato (also sold as dinosaur or Tuscan kale) has flat, blistered, blue-green straps with a sweeter, milder character that cooks love — though it's a bit less winter-proof. Red Russian types (catalog page) are a different species with tender, purple-veined, oak-shaped leaves that make the best raw salads; their Siberian cousins are similarly tender and quick. Any of them can also be sown thick and cut at baby size — the catalog's baby-leaf window is under five weeks. Browse the full kale catalog page for the range.

Starting and spacing kale

You can direct-sow kale or set out transplants. For a spring crop, start seeds indoors 4–6 weeks before your last frost and transplant out; for a fall crop, sow in midsummer so plants mature into cooling weather. Give each plant about 18 inches (they get large) in full sun to part shade, in soil enriched with compost. As a leafy brassica, kale appreciates steady nitrogen and even moisture.

The catalog puts numbers on that: seedlings are transplant-ready 4–6 weeks after sowing, get a 7–10 day hardening-off, and can go out 2–4 weeks before last frost — young kale takes frost in stride. Full-size plants run roughly 50 to 75 days to maturity, so for the fall crop count back from your first frost date and sow about ten to twelve weeks ahead of it; the July–August fall-garden guide walks through the math. In a square-foot layout the value is 12 inches — one plant per square — a workable minimum if you pick steadily; baby-leaf bands can be sown far thicker. Feed with compost at planting plus a nitrogen boost every four to six weeks while leaves are being pulled (feeding cadence here), and keep an inch of water a week going in dry spells.

Watch for the brassica pests

Kale's main trouble is the cabbage family's usual cast: cabbage worms (the velvety green caterpillars of those white butterflies), aphids tucked in the crinkles, and flea beetles shotholing young leaves. A floating row cover over young plants heads off most of it, and rotating brassicas away from last year's bed (see crop rotation) keeps soil pests from building up.

A few refinements: gray-green cabbage aphids colonize the leaf crinkles in cool weather and laugh at a light spray, so blast colonies early with water and follow the aphid playbook; harvesting the infested lower leaves and binning them removes most of the population at once. Extension trap-crop work supports planting a strip of mustard greens or nasturtiums nearby to pull flea beetles and cabbage aphids off the kale — honest odds, not a guarantee. And if leaves yellow from the bottom while veins stay green in a bed that's grown brassicas for years, read up on wilt diseases and move the crop next season.

Pick from the bottom up

Harvest kale like a many-week investment: take the lowest, oldest leaves first, snapping or cutting them off and leaving the growing tip and young center leaves intact. The plant keeps pushing new growth from the top, so one plant feeds you for months. Pick leaves while they're a usable hand-size — older leaves toughen — and a few plants will keep a household in greens far longer than a row of lettuce ever could.

By late season you'll have a palm-tree silhouette: bare stalk below, fresh rosette on top. That's a healthy, well-harvested plant, not a failing one. Kale keeps about a week in the refrigerator in a loose bag, and it's one of the best greens for the freezer — blanch and bag as covered in freezing and preserving. Overwintered plants bolt in their second spring; the flower buds are a bonus harvest, picked and cooked like tiny sweet broccoli before the yellow blooms open.

Stretch it into winter

Kale is the crop that makes season extension feel like cheating, because the plant does most of the work. A single hoop of row-cover fabric over the fall bed keeps leaves picking-quality for weeks after open-garden kale goes leathery, and a cold frame or low tunnel carries harvests into genuinely cold months. The rhythm changes in winter: growth nearly stops, so you're not growing kale anymore, you're storing it alive — pick lightly and let every plant keep a working rosette. Harvest on days above freezing (frozen leaves shatter, then bruise), or wait for a midday thaw. Deep-mulched crowns that die back in a brutal snap often push a surprise flush of sweet new leaves in earliest spring, a full month before any new sowing could deliver.

Kale in containers

One kale plant in a 12-inch (3-to-5-gallon) pot is a surprisingly good deal: months of harvests from a doorstep container, with the same bottom-up picking routine (container basics). Container kale needs steadier water and a monthly feed, and in summer it appreciates afternoon shade. For a salad supply, sow a wide, shallow trough thickly with Red Russian and cut baby leaves every couple of weeks. Cold is no objection out there either: potted kale rides fall temperatures down as far as bedded kale does, and sliding the container against a sheltered wall — or into an unheated porch during the worst snaps — keeps a doorstep plant pickable when the garden path is a luge run. Between the winter bed, the freezer bags, and the porch pot, one spring's sowing of kale can genuinely span three seasons of eating. Set your sowing dates with the planting calendar.