Oenothera macrocarpa
Missouri Evening Primrose
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Missouri Evening Primrose (Oenothera macrocarpa) - Description
O. macrocarpa is native to the south-central United States. It bears narrow, lance-shaped leaves to 3 inches in length. It also produces pure yellow, 4 inch flowers that remain open all day, in late spring to early fall.
Missouri Evening Primrose (Oenothera macrocarpa) - Blooming
Blooms during the summer with large cup-shaped flowers that are usually white, yellow, or pink. The flowers open at dawn or dusk.
Missouri Evening Primrose (Oenothera macrocarpa) - Growth
Evening Primroses do well in full sun. Plant height varies depending on variety. One species can grow to approx. 6 ft. tall. Works great in a rock garden.
Missouri Evening Primrose (Oenothera macrocarpa) - Planting
Propagate from the seed. Annuals and perennials should be planted in spring, biennials in summer (if planting in containers in a cold frame). Can also plant annuals and biennials "in situ" in fall. Propagate from softwood cuttings of perennials in spring before flowering occurs. Plant cuttings at a distance from seeded plants to avoid interference between taproot species. Can achieve this by first planting in containers.
Missouri Evening Primrose (Oenothera macrocarpa) - Pest
Under wet conditions, Oenothera is susceptible to root rot. Other issues include downy mildew, powdery mildew, rust, leaf gall, and leaf spot, all of which are quite common.
Missouri Evening Primrose (Oenothera macrocarpa) - Interesting facts
Oenothera is mostly native to North America, although some species are found in South America.
Missouri Evening Primrose (Oenothera macrocarpa) - Soil and irrigation
Plant requires little irrigation. Does best in poor-moderately fertile, gritty soil. Soil must be well-draining.
