Valued for showy, four-petaled, silky flowers in bright yellow, pink, or white. Some types display their blossoms during the day, others open in late afternoon and close the following morning. Flowers of some are fragrant. Plants succeed in tough, rough places with poor soil and little care.
Oenothera speciosa is native to the southwestern U.S. and Mexico. It grows to 1 ft. high and 3 ft. or more wide, spreading by rhizomes. Forms rosettes of medium green, oblong to lance-shaped, 1–3-in.-long leaves. Fragrant, 2-in. flowers are white to pinkish, aging to pink; despite plant’s common name, they open during the day. Blooms spring or early summer into fall, then stems die back. Good ground cover for dry slopes or parking strips.