SelecTree: Tree Detail
Photo Locations: Cal Poly Campus - San Luis Obispo, CA, Santa Barbara, CA, Davis, CA, Sonoma, CA, Balboa Park - San Diego, CA, Sacramento, CA and Quail Arboretum - Encinitas, CA
Underside of leaf is light gray. Leaf drop in spring may seem abnormal, but is typical pattern for the tree. Bark is the source of commercial cork.
Native to Western Mediterranean and North Africa.
A Quercus suber in Napa, CA is registered as a California Big Tree. It measures 89 feet high, with a trunk circumference of 245 inches and a crown spread of 81 feet.
Erect or Spreading and requires ample growing space.
Rounded or Spreading Shape.
Has Evergreen foliage.
Height: 70 feet.
Width: 70 feet.
Growth Rate: 24 to 36 Inches per Year.
Longevity Greater than 150 years.
Leaves Oblong to Ovate, Dark Green, No Change, Evergreen.
Flowers Inconspicuous. Flowers in Spring. Has separate male and female reproductive parts on the same tree (monoecious).
Prolific, Brown Acorn, Medium (0.50 - 1.50 inches), fruiting in Fall or Winter.
Bark Light Green or Light Gray, Fissured.
Shading Capacity Rated as Moderate to Dense in Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones 5 - 16 and 18 - 24.
USDA Hardiness Zones 8 - 10.
Exposure Full Sun to Partial Shade.
Moist to Dry Soil.
Clay, Loam or Sand Texture.
Highly Acidic to Slightly Alkaline Soil pH.
Seaside Tolerance is Medium in Mild Zone.
Pests & Disease Information
Resistant to Verticillium. Susceptible to Invasive Shot Hole Borer, Armillaria, Phytophthora and Root Rot.
Health, Safety & Environmental Concerns
Branch Strength Rated as Strong.
Root Damage Potential Rated as Moderate.
Allergy and Poisonous Health Hazard.
Biogenic Emissions considered High.
Fire Resistance is Favorable.
Desirable Wildlife Plant.
Attracts Birds and Squirrels.
Cite this tree:
SelecTree. "Quercus suber Tree Record." 1995-2021. Apr 17, 2021.
< https://selectree.calpoly.edu/tree-detail/quercus-suber >
SelecTree Nursery Connection Map
Cal Poly / ESRI