late June through September
1 to 2 ft.
18 to 24 in.
south central United States
USDA zones 4-8
hardy to 8,000 ft.
Missouri evening primrose is a low-growing perennial flower with trailing stems and deep green leaves. The large lemon-yellow flowers, which can reach up to 3 inches in diameter, bloom in the late afternoon and last until the next day. The seedpod is a unique-looking large winged capsule, 2 to 3 inches in length.
Missouri evening primrose has eye-catching large yellow flowers. In addition, the seed pods add late season interest. Evening primrose needs little care, but flea beetles frequently chew holes in the leaves. Flea beetle damage can disfigure the plant extensively for a growing season, but only occur in large numbers every few years.
In early spring, cut the old growth to ground level.