Quercus douglasii - Blue oak

Blue oak (Quercus douglasii) is a slow-growing, long-lived deciduous oak native to California foothill woodland, its acorns historically a staple food once leached of bitter tannins.¹

Inputs

• Hardiness zone 8¹
• Hardiness zone 9¹
• Hardiness zone 10¹
• Hardiness zone 11¹
• Full sun¹
• Semi-shade¹
• Well drained soil¹
• Moist soil¹

Outputs

• Human food¹
• Acorn¹
• Medicinal use¹
• Dye¹
• Wood¹

Type

• Quercus spp. - Oaks
• Tree
• Deciduous

Functions

• Fire resistance²

Footnotes

1. Quercus douglasii | Plants for a Future ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴

2. Leaf burn times of California native plants, Las Pilitas Nursery, 2005 propane-torch ignition trial, live-leaf ignition time >60 seconds ↩