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Sundrop, Sierra Sundrop
Scientific Name: Calylophus hartwegii (Benth.) P.H. Raven
Synonym: Oenothera hartwegii
Family: Onagraceae

Show Larger Picture Calylophus at the Phoenix Desert Botanical Garden fall sale

Recommended Temperature Zone: sunset: 2-3,10-13 USDA: 9-12 Frost Tolerance: Hardy in Phoenix to 20°F (-6°C) Sun Exposure: Full sun to part sun Origin: USA (Arizona, New Mexico, Texas), northern Mexico Growth Habits: Perennial up to 8 inches tall (20 cm), 2 feet in diameter (60 cm) Watering Needs: Moderate water Propagation: Clump division

Propagation:
The yellow, 1 inch wide flowers appear from spring to fall. The plant is dormant in winter.