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Blue oak

Blue oak

Quercus douglasii

tree☀️ full sun💧 low waterZone 8aZone 10b

A native California oak with distinctive blue-gray foliage and a wide, spreading crown. Highly drought-tolerant and ideal for dry landscapes, it produces acorns that support local wildlife.

Overview

Form
spreading, rounded crown
Growth Rate
slow
Size
30–60′ tall × 30–50′ wide
Dormancy
deciduous

Tolerances & Soil

high

Flood Tolerance

none
Zone 8aZone 10b
1471013
ColderWarmer
Zone range: Zone 8a to Zone 10b

pH Range

4.57.5
7.0
3.556.589
pH range: 4.5 to 7.5

Soil Texture

Coarse, Medium

Seasonality

Bloom Season

J
F
M
A
M
J
J
A
S
O
N
D

Season of Interest

SpringFall

Canopy

The tallest trees that form the overstory.

Sub-canopy

Smaller trees living beneath the canopy.

Succession Role

mid successionalclimax

Native to the United States

Native Range

California (Sierra Nevada foothills and interior valleys)

Native to: California

Function & Care

biomass/mulchwindbreak
Coppicing

Establishment & Care

Establishment
moderate
Maintenance
low
Propagation
seed

Companion Planting

Plants well with