SelecTree: Tree Detail
Photo Locations: Stanford University - Palo Alto, CA, UC Davis Arboretum - Davis, CA, Bakersfield, CA, Los Angeles County Arboretum - Arcadia, CA and Hoyt Arboretum - Portland, OR
Similar to valley oak but not native to California. Requires a moderate amount of water. Hardy to 10 degrees F.
Native to Europe, Northern Africa, and Western Asia.
A Quercus robur in Pleasanton is registered as a California Big Tree. It measures 92 feet high, with a trunk circumference of 146 inches and a crown spread of 94 feet.
Additional Common Names
ENGLISH OAK, PEDUNCULATE OAK
Erect or Spreading and requires ample growing space.
Oval, Rounded or Umbrella Shape.
Has Deciduous foliage.
Height: 60 - 120 feet.
Width: 30 - 80 feet.
Growth Rate: 36 Inches per Year.
Longevity Greater than 150 years.
Leaves Ovate or Oblong and Lobed, Medium to Dark Green, Bronze, Gold or No Change, Deciduous.
Flowers Inconspicuous. Flowers in Spring. Has separate male and female flowers on the same tree (monoecious).
Brown Acorn, Medium (0.50 - 1.50 inches), fruiting in Fall or Winter.
Bark Dark Brown or Dark Gray, Fissured.
Shading Capacity Rated as Moderate in Leaf.
Shading Capacity Rated as Moderate out of Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones 1 - 12 and 14 - 21; A2, A3.
USDA Hardiness Zones 5 - 8.
Exposure Full Sun to Partial Shade.
Moist to Dry Soil.
Loam or Sand Texture.
Highly Acidic to Slightly Alkaline Soil pH.
Salinity Tolerance is Moderate on Coast.
Seaside Tolerance is Good in Mild Zone.
Pests & Disease Information
Resistant to Verticillium. Susceptible to Insect Galls, Powdery Mildew.
Health, Safety & Environmental Concerns
Branch Strength Rated as Strong.
Root Damage Potential Rated as Moderate.
Allergy and Poisonous Health Hazard.
Biogenic Emissions considered High.
Desirable Wildlife Plant.
Attracts Birds and Squirrels.
Cite this tree:
SelecTree. "Quercus robur Tree Record." 1995-2018. Mar 17, 2018.
< http://selectree.calpoly.edu/tree-detail/quercus-robur >
SelecTree Nursery Connection Map
Cal Poly / ESRI