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Ozark Sundrop, Yellow Evening Primrose
Scientific Name: Oenothera macrocarpa Nutt.
Synonym: Oenothera missouriensis
Family: Onagraceae
Ozark Sundrop, Yellow Evening Primrose (Oenothera macrocarpa)
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Oenothera macrocarpa at the Flagstaff Arboretum
Recommended Temperature Zone:
sunset: 2-24,30,33-37,39
USDA: 3-8

Sun Exposure: Full sun to part shade

Origin: Central USA, from Nebraska and Illinois to Texas

Growth Habits: Herbaceous perennial with trailing habit, 10 to 20 inches tall (25-50 cm), 12 inches spread (30 cm); tap root

Watering Needs: Low water use, needs good drainage

Propagation: Seed, division, does not transplant well when established because of its tap root

Ozark Sundrop, Yellow Evening Primrose (Oenothera macrocarpa)

Blooming Habits:
Lemon-yellow flowers, 3 to 4 inches in diameter from late spring to mid-summer. Each blossom opens in the evening and lasts only one day, closing in the morning.

Fruiting Habits:
Four-sided winged pod, up to 2.8 inches long (7cm).

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