SelecTree: Tree Detail

ISLAND OAK
Quercus tomentella

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Photo Locations: Cal Poly State University - San Luis Obispo, CA, Santa Babara Botanic Garden - Santa Babara, CA and Quail Botanical Gardens - Encinitas, CA

General Notes

This evergreen Oak is a desirable landscape tree in southern California. Smooth gray bark when young becomes brown and blocky with age. Found natively on the Channel Islands. Prefers deep, moist soils but can tolerate a wide range of soil conditions. Slightly toothed, glossy green leaves are covered with tan hairs below.

Native to California and Mexico.

A Quercus tomentella in Santa Barbara Botanic Garden is registered as a California Big Tree. It measures 53 feet high, with a trunk circumference of 91 inches and a crown spread of 60 feet.

Family: Fagaceae

Tree Characteristics

Erect or Spreading and requires ample growing space.

Rounded Shape.

Has Evergreen foliage.

Height: 20 - 50 feet.

Width: 25 - 40 feet.

Growth Rate: 24 Inches per Year.

Leaves Ovate, Glossy Dark Green, No Change, Evergreen.

Flowers Inconspicuous. . Has separate male and female flowers on the same tree (monoecious).

Brown Acorn, Medium (0.50 - 1.50 inches).

Bark Dark Gray / Brown, Blocky or Smooth.

Tree Site Conditions & Constraints

Sunset Zones 7 - 9, 14 - 17 and 19 - 24.

Exposure Full Sun to Partial Shade.

Moist to Dry Soil.

Drought tolerant.

Clay, Loam or Sand Texture.

Pests & Disease Information

Resistant to Verticillium. Susceptible to Armillaria.

Health, Safety & Environmental Concerns

Desirable Wildlife Plant.

Attracts Birds and Squirrels.

Cite this tree:
SelecTree. "Quercus tomentella Tree Record." 1995-2018. Dec 18, 2018.
< https://selectree.calpoly.edu/tree-detail/quercus-tomentella >

SelecTree Nursery Connection Map
Cal Poly / ESRI