Calylophus hartwegii fendleri
Western natives related to and much resembling evening primrose (Oenothera), with bright yellow, four-petaled flowers over a long summer bloom period. Plants are 1–2 ft. tall. In Zone 13, flowering declines in summer heat, and plants flower in spring and from late summer to fall. Plants spread by rhizomes and are useful for summer color in difficult climates. Shear just before spring growth begins. Plant in well-drained soil. They tolerate regular water if drainage is superb.Calylophus hartwegii fendleri
Grows up to 1 ft. high, 2 ft. across, with inch-wide flowers; those of ‘Sierra Sundrop’ are larger. Calylophus hartwegii lavandulifolius (C. lavandulifolius) has narrow, gray leaves. Excellent in hot, dry locations and when mixed with desert perennials.
Native to the dry regions of the Southwest and northward to Canada. Forms a clump to 1–2 ft. hig...
Native from southern Wyoming to Arizona and New Mexico. Grows to 2–3 ft. tall and 2 ft. wide. Da...
Grows up to 1 ft. high, 2 ft. across, with inch-wide flowers; those of ‘Sierra Sundrop’ ar...