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Family: fagaceae
Common name(s): Blue Oak
Hardiness ratings: USDA zone 5 - 10 
General resources
Links for Quercus douglasii
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments.
 (6 photos)
- Garden.org - Community-assembled plant profile (9 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (14 photos)
- Las Pilitas Nursery - Catalog page about this California native, with description and horticultural basics. (zone 5-10) (6 photos)
- Trees and Shrubs Online - Reference page curated by the International Dendrology Society with descriptive characteristics and horticultural notes. (4 photos)
- Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (6 photos)
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