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Calylophus hartwegii fendleri (photo courtesy of Annie’s Annuals & Perennials)
Calylophus hartwegii fendleri (photo courtesy of Annie’s Annuals & Perennials)

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Zone
Zones 1A, 1B, 2A, 2B, 3A, 3B, 10-13
Full SunPartial Sun
Full, Partial
Regular WaterMinimal Water
Moderate, Minimal

Calylophus hartwegii fendleri

Sundrops
Onagraceae
Perennials

CALYLOPHUS

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.

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Calylophus hartwegii fendleri

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