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Sundrop, Sierra Sundrop
Scientific Name: Calylophus hartwegii (Benth.) P.H. Raven
Synonym: Oenothera hartwegii
Family: Onagraceae
Sundrop, Sierra Sundrop (Calylophus hartwegii)
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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 20F (-6C)

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

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

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