Quercus douglasii

Blue Oak
Blue Oak
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Plant Type

Tree

Evergreen-Deciduous

Deciduous

Overall Mature Size

Large

Mature Height & Spread

30-50′ x 40-60′

Exposure

Full sun

Water

Low water

Flower Color

Inconspicuous

Bloom Time

Spring

Special Features

Attracts Birds, Butterflies, Deer Resistant, Drought Resistant

Container Sizes

#5, #15

Natural Growth Habit

Broad

Sunset Garden Zones

3-11, 14-24

Minimum USDA Hardiness Zone

6B-9A

Slow-growing deciduous tree to 30-50′ tall x 40-60′ wide. This low-branching, wide-spreading California native is upright and oval in youth, eventually forming a picturesque spreading canopy with age. This species is immune to Sudden Oak Death (a pathogen that has in recent years claimed a number of other oak species) and features attractive blue-green foliage that turns shades of bronzy-pink, orange and yellow in the cool of fall. Inconspicuous spring flowers with copious amounts of pollen are followed by egg-shaped, ¾ to 1 ¼” brown acorns appearing in late-summer to fall, persisting into winter. Best-suited to large open areas that can accommodate its large size and eventual spreading nature.  Tolerates heat, drought, and a variety of soil types provided they’re fast-draining. Thrives in a full sun exposure.

USDA Zone: 6B-9A
Sunset Zone: 3-11, 14-24

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