SelecTree: Tree Detail

HOLLY OAK
Quercus ilex

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Photo Locations: San Luis Obispo, CA, Balboa Park - San Diego, CA, Arroyo Grande, CA, Alameda Plazas Park - Santa Barbara, CA, Fresno, CA and Los Angeles County Arboretum - Arcadia, CA

General Notes

Underside of leaf is silvery-white. Often has a prominent umbrella form.

Native to Western Mediterranean Region.

A Quercus ilex in Sacramento Capital Park # 23 is registered as a California Big Tree. It measures 70 feet high, with a trunk circumference of 132 inches and a crown spread of 92 feet.

Family: Fagaceae

Additional Common Names

HOLLY OAK, HOLM OAK

Tree Characteristics

Erect or Spreading and requires ample growing space.

Rounded or Umbrella Shape.

Has Evergreen foliage.

Height: 30 - 60 feet.

Width: 30 - 60 feet.

Growth Rate: 24 Inches per Year.

Longevity Greater than 150 years.

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

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

Brown Acorn, Medium (0.50 - 1.50 inches), fruiting in Winter or Summer.

Bark Light Green or Light Gray, Furrowed or Smooth.

Shading Capacity Rated as Dense in Leaf.

Litter Issue is Dry Fruit.

Tree Site Conditions & Constraints

Sunset Zones 4 - 24.

USDA Hardiness Zones 7 - 9.

Exposure Full Sun to Partial Shade.

Moist to Dry Soil.

Clay, Loam or Sand Texture.

Highly Acidic to Highly Alkaline Soil pH.

Salinity Tolerance is Good to Moderate on Coast.

Seaside Tolerance is Good in Moderate Zone.

Pests & Disease Information

Resistant to Oak Root Fungus and Verticillium. Susceptible to Scales and Spider Mites, Anthracnose and Root Rot.

Health, Safety & Environmental Concerns

Branch Strength Rated as Strong.

Root Damage Potential Rated as Low.

Allergy and Poisonous Health Hazard.

Biogenic Emissions considered High.

Desirable Wildlife Plant.

Attracts Birds and Squirrels.

Special Uses & Values

Hedged.

Cite this tree:
SelecTree. "Quercus ilex Tree Record." 1995-2017. Oct 20, 2017.
< http://selectree.calpoly.edu/tree-detail/quercus-ilex >

SelecTree Nursery Connection Map
Cal Poly / ESRI