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Family: rosaceae
Common name(s): Rock Spiraea
Hardiness ratings: USDA zone 3~5 - 8~9 
General resources
Links for Petrophytum caespitosum
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 5-9)
 (4 photos)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (zone 3) (2 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (2 photos)
- Las Pilitas Nursery - Catalog page about this California native, with description and horticultural basics. (zone 5-8) (5 photos)
- Ontario Rock Garden Society - Germination information (use search on page to find this taxon)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 5-8)
- Southwest Colorado Wildflowers - Photos and botanical information about the species/genus. (1 photo)
- Trees and Shrubs Online - Reference page curated by the International Dendrology Society with descriptive characteristics and horticultural notes.
- Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (4 photos)
Links
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