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Rock Spiraea

Petrophytumcaespitosum

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Family

Rosaceae (ro-ZAY-see-ee)

Info

Genus

Petrophytum (pet-roh-FY-tum)

Info

Species

caespitosum (kess-pi-TOH-sum)

Info

Synonym

Sun Exposure

Full Sun

Foliage

Evergreen

Provides Winter Interest

Height

under 6 in. (15 cm)

Spacing

4-6 ft. (1.2-1.8 m)

Hardiness

USDA Zone 5a: to -28.8 °C (-20 °F)

USDA Zone 5b: to -26.1 °C (-15 °F)

USDA Zone 6a: to -23.3 °C (-10 °F)

USDA Zone 6b: to -20.5 °C (-5 °F)

USDA Zone 7a: to -17.7 °C (0 °F)

USDA Zone 7b: to -14.9 °C (5 °F)

USDA Zone 8a: to -12.2 °C (10 °F)

USDA Zone 8b: to -9.4 °C (15 °F)

USDA Zone 9a: to -6.6 °C (20 °F)

USDA Zone 9b: to -3.8 °C (25 °F)

Danger

N/A

Bloom Color

White/Near White

Cream/Tan

Bloom Time

Late Summer/Early Fall

Mid Fall

Other Details

Gardener's Notes:

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Kelli

L.A. (Canoga Park), CA (Zone 10a) | December 2007 | neutral

According to "A Field Guide to the Plants of Arizona", also known as rock mat, rockrose, and Rocky Mountain rockmat.

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