Missouri Evening Primrose
Details10" tall x 18-24" wide (seed propagated). This native wildflower is renowned for the huge 4" yellow flowers that open each afternoon and close up the following morning. Long blooming throughout the summer months, it keeps going until it feels it has set enough seed pods to retire for the season. Long-lived, it forms a huge underground tuber to keep itself going from year to year. Evening Primrose cascades nicely over rocks and retaining walls. (Botanists have changed the name for this species from missouriensis to macrocarpa).
HBLC921 (Plant - 2.5" deep pot) - Out of stock.
72150 (Plant - 5" deep pot) - Out of stock.
|Common Name||Missouri Evening Primrose|
|Botanical Name||Oenothera macrocarpa|
|Zones||4, 5, 6, 7, 8|
|Light Requirements||Full Sun|
|Mature Height||10" tall|
|Mature Spread||18-24" wide|
|Ships As||Potted Plant|
|Planting Time||Spring / Summer, Fall|
|Soil Type||Clay Soil, Sandy Soil, Average Soil|
|Soil Moisture||Drought Resistant / Waterwise|
|Amount of Rain||10 to 20", 20 to 30", 30 to 40" (with care)|
|Advantages||Deer Resistant, Attract Butterflies, Easy to grow, Fragrant Flower / Foliage, Good for Containers, Groundcover, Native, Extended Bloom Time (more than 4 weeks), Good Rockgarden or alpine plant, Great for Mass Plantings|
|Ideal Region||Anywhere In The US, Northeast, Midwest, Southwest, West, Pacific Northwest|
|Neonicotinoid-Free||Yes - Learn More|
|Ships to Hawaii, Alaska & Canada||No|
- Plant in low fertility ("lean") soil including dry clay, positioned in full sun. Mulch with gravel or not at all.
- Water regularly the first growing season to establish the plant. Thereafter, infrequent but deep watering is all this plant needs.
- Deadheading is not needed as these are naturally long blooming species. Fertilize lightly in the fall with Yum Yum Mix. Special comments
- Oenothera are tap rooted plants and does not like to be transplanted once established. Don't divide as they resent having their roots disturbed.
- Leave standing over the winter and cut back hard, leaving 2 to 3 inches of stems above ground.
- O. speciosa 'Rosea' is a showy everblooming species that can spread aggressively and should not be planted into areas where it's enthusiastic nature can be a problem. Deadheaded to reduce reseeding. Dig out suckering roots when spreading too wide.
- Watch for flea beetles (small metallic green beetles) which can defoliate the plants in late spring/early summer.
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USDA Hardiness Planting Zones
To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.
- If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
- If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).
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