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California Blue Oak, Iron Oak
Scientific Name: Quercus douglasii Hook. & Arn.
Family: Fagaceae
California Blue Oak, Iron Oak (Quercus  douglasii)
Picture U.S.D.A Forest Service, Courtesy of the Hunt Institute
Recommended Temperature Zone:
sunset: 1-11,14-24
USDA: 5-10

Sun Exposure: Full sun

Origin: California (USA), around the Central Valley

Growth Habits: Deciduous tree, growing rather slowly to 20 to 65 feet tall (6-20 m), 20 to 50 feet spread (6-15 m); trunk 14 to 24 inches in diameter (35-60 cm); thin and flaky bark; leathery, wavy blue green leaves, with a yellowish-green underside, 1 to 3 inches long (2.5-7.5 cm).

Watering Needs: Little water and good drainage, flood tolerant

Propagation: Fresh seeds (acorns) best sown in place since the seedling rapidly develops a large taproot

This oak was named for the Scottish biologist David Douglas.

Blooming Habits:

Fruiting Habits:
The edible acorns are 0.8 to 1.2 inches long (2-3 cm), with a shallow cup, usually solitary, maturing in a single season, and germinating without a rest period.

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Desert-Tropicals is dedicated to provide gardening advice, gardening ideas, and information about flower of all kind for landscape and collections. We try to check carefully the identification of the plants on the illustrations as well as the other information from the page, but occasionally errors do occur. if you notice anything that needs to be changed please contact us. Thanks.

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