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.
Thespecies can reach 10 ft. talland 4 ft. wide; it has light green,deeply lobed leaves to 4 in.long an...
Native to western and central North America. This striking perennialgrows 2–4 ft. tall and not quite a...
Mostly native to the Mediterranean region, these mounding plants brighten spring bordersand rock garde...