Quercus douglasii

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Quercus douglasii
Quercus douglasii
Quercus douglasii

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'

Songbird iconA.jpg Butterfly iconA.jpg Slope iconA.jpg

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.