Ozark Sundrops or Missouri Primrose or Glade Lily or Bigfruit Evening Primrose Onagraceae:
Plants are shorter than other yellow species of Oenothera, reaching a height of 7 to 12 inches. The plants produce many 3 to 4 inch wide, yellow colored flowers in early summer with plants blooming from June - September, and some bloom until hard frost. The flowers open up in the evening and are open all night, were they are visited by moths, and close sometime before noon. Stems tend to be some what lax and plants form large spreading clumps that grow to a height of 5 to 8 inches, with a good amount of basal foliage. The foliage has an undulating habit with long elliptic or lanceolate-shaped leaves. Grow in full sun and space plants out about 12inches apart in well- draining soils with a pH between 5.8 - 6.8 Drought tolerant. Best results in nutrient poor soils, nitrogen rich soils will produce plants with a lot of soft foliage a fewer flowers. Mixes well with the shorter growing Catmints and Shasta Daisies, effectively used as a mass planting and used as a ground cover amongst large rocks.
Native to south central United States. Cover seeds, darkness needed for best germination, Seeds germinate in less than 2 to 3 weeks, keep seed in constant moisture (but not wet) with temperatures around 70F. After germination grow out seedlings cooler, with 55 to 60F. working well.