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Large-Flowered Evening Primrose

Oenothera glazioviana
Also known as: Large-Flowered Evening Primrose, Redsepal Evening Primrose

Large-Flowered Evening Primrose is a flower in the Onagraceae family. It grows best in full sun with dry to medium moisture, and is listed for USDA zones 4-8. Plants reach maturity about 308–422 days after planting and sit about 12 inches apart.

Varieties

1 from True Leaf Market · sorted by days to maturity
  • ▸Dwarf308–422 days

    Non-GMO; Container

    Oenothera glazioviana (syn. O. lamarckiana) - Perennial with stems 2 inches long. Drought Tolerant and long-lived. Makes a great ground cover. Evening Primrose Flower Seeds - Dwarf - Oenothera glazioviana. Non-GMO - Open Pollinated - High Germination Rate. Seeds For: Flower Gardening. Days to Full Maturity: 2nd Yr -- Perennial -- USDA Hardiness Zone: 4-8. Mountain Valley Seed Company Brand - Premium Quality Seeds.

    View on True Leaf Market ↗
Family
Onagraceae
Category
Flower
Form
Bush
Lifecycle
biennial
Zone
4-8
Height
1–1.5 ft
Spread
1–1.5 ft
Sun
Full sun

Plant spacing

1 plant per square footSquare-foot planting diagram: one large-flowered evening primrose fills a 1-foot square, spaced 12 inches from its neighbors.
1 plant per square foot

In a square-foot bed, space large-flowered evening primrose about 12 in apart — that fits 1 plant in each 1-foot square (1×1). Wider rows or containers space the same.

Water
Dry to medium

Plan your large-flowered evening primrose planting

Add large-flowered evening primrose 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.

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At a glance

Days to harvest
308–422 days
From transplant or sow to first harvest
Harvest style
Harvest once
One main harvest
After harvest
Use within days
Quality eases off after peak
Frost tolerance
Hardy · to ~20°F
Lowest temperature the foliage usually survives
Germination
~60%
Typical minimum germination rate

Growing timeline

When to plant and harvest large-flowered evening primrosePlanting timeline for large-flowered evening primrose, relative to last frost: start indoors from 10 weeks before last frost to 2 weeks before last frost; grow from 2 weeks before last frost to 42 weeks after last frost; harvest from 42 weeks after last frost to 58 weeks after last frost.Start indoorsGrowHarvestLast frostTransplant
Start large-flowered evening primrose indoors ~8 weeks before transplanting 2 weeks before last frost; first harvest 42 weeks after last frost.
Seed to transplant
42-56 days
Outdoor planting
-14 to 0 days vs frost
Propagation
Seed
Schedule anchor
Last Frost

Care & troubleshooting

No curated care & troubleshooting advice for large-flowered evening primrose yet. Our extension-sourced library currently focuses on common edible crops; we're expanding it over time.