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Ozark Sundrop, Yellow Evening Primrose
Scientific Name: Oenothera macrocarpa Nutt.
Synonym: Oenothera missouriensis
Family: Onagraceae

Show Larger Picture 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

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).