Western natives related to and much resembling evening primrose (Oenothera), with bright yellow, four-petaled flowers over a long summer bloom period. Plants are 1 to 2 ft. tall. In Zone 13, flowering declines in summer heat, and plants flower in spring and from late summer to fall. Spread by rhizomes and are useful for summer color in difficult climates. Shear just before spring growth begins. Plant in well-drained soil. Tolerate regular water if drainage is superb.Calylophus drummondianus
To 1 1/2 ft. high, 2 ft. wide, with narrow, tooth-edged, somewhat drooping leaves and inch-wide flowers. This species blooms for a longer period than C. hartwegii in spring, but it does not rebloom as well in fall.
Biennial or short-lived perennial. From southernEurope, northwestern Africa.Soft, scallop-edged, silky...
Native to East Asia; forms fans of sword-shaped leaves from slowly creeping rhizomes. The plants are p...
Native to California. This is a rather uncommon plant in nature; blooms from spring to early summer, w...