SelecTree: Tree Detail
OREGON WHITE OAK
Photo Locations: Redding, CA, UC Davis Arboretum - Davis, CA, Rancho Santa Ana Botanic Gardens - Claremont, CA, Regional Parks Botanic Garden, UC Berkeley Botanic Garden - Berkeley, CA, Tilden Regional Park - Berkeley, CA and Santa Barbara Botanic Garden - Santa Barbara, CA
Underside of leaf is rusty or downy. Similar to valley oak, but found more commonly in foothill areas. Can occur in shrub or tree forms.
Native to Western North America.
A Quercus garryana in Six Rivers National Forest, Boise Creek Campground is registered as a California Big Tree. It measures 81 feet high, with a trunk circumference of 142 inches and a crown spread of 76 feet.
Additional Common Names
OREGON WHITE OAK, GARRY OAK
Erect or Spreading and requires ample growing space.
Rounded or Spreading Shape.
Has Deciduous foliage.
Height: 40 - 90 feet.
Width: 30 - 60 feet.
Growth Rate: 12 Inches per Year.
Longevity 50 to 150 years or more.
Leaves Oblong to Obovate and Lobed, Dark Green, Golden or Yellow or Orange, Deciduous.
Flowers Inconspicuous. Flowers in Spring. Has separate male and female reproductive parts on the same tree (monoecious).
Brown Acorn, Medium (0.50 - 1.50 inches), fruiting in Fall or Winter.
Bark Dark Brown, Light Gray or Light Green, Furrowed or Scaly.
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 2 - 11 and 14 - 23.
USDA Hardiness Zones 7 - 9.
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 Good in Mild Zone.
Pests & Disease Information
Resistant to Verticillium. Susceptible to Beetle Borers, Caterpillars, Insect Galls and Scales, Crown Rot, Mistletoe, Armillaria 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.
Cite this tree:
SelecTree. "Quercus garryana Tree Record." 1995-2020. Aug 9, 2020.
< https://selectree.calpoly.edu/tree-detail/quercus-garryana >