From California Natives Wiki
Species Name: Quercus douglasii
Common Name: Blue Oak
- Picturesque, open tree. Will add character to your landscape. Tolerates extreme heat and drought. Striking blue-grey foliage. Excellent for wildlife. It is a larval food plant for the Mournful Duskywing butterfly.
- Plant Family: Fagaceae
- Plant Type: Tree
- Height by Width: 20-30' H x 20' W
- Growth Habit: Upright and rounded
- Deciduous/Evergreen: Winter deciduous
- Growth Rate: Slow
- Sun Exposure: Full sun
- Soil Preference: Adaptable
- Water Requirements: Drought-tolerant to occasional
- Cold Hardy to:
- Flower Season: Spring
- Flower Color: Acorns
- Endangered?: Not Listed
- Distribution: Inner North Coast Ranges, Foothills of the Cascade Range, Sierra Nevada Foothills, Tehachapi, Inner South Coast Range, North slope of the Western Transverse Range
- Natural Habitat: Dry slopes, interior foothills, woodlands below 3600'
- Care and Maintenance
- Other Names
- Bornstein, Carol, David Fross, and Bart O'Brien. California Native Plants for the Garden. Los Olivos, CA: Cachuma Press. 2005.