SelecTree: Tree Detail
CALIFORNIA BLACK OAK
Photo Locations: Cal Poly State University - San Luis Obispo, CA, Ukiah, CA, Blake Garden - Kensington, CA, Regional Parks Botanic Garden, Tilden Regional Park - Berkeley, CA, Santa Barbara Botanic Garden - Santa Barbara, CA and Mt Shasta, CA
Golden fall color contrasts nicely with dark green conifers. Occasionally a reddish fall color is seen on individual trees. Sudden Oak Death manifested as a canker.
Native to Southern Oregon to Southern California.
A Quercus kelloggii in Groveland, Hwy 120 is registered as a California Big Tree. It measures 91 feet high, with a trunk circumference of 286 inches and a crown spread of 114 feet.
Additional Common Names
CALIFORNIA BLACK OAK, BLACK OAK, KELLOGG OAK
Erect or Spreading and requires ample growing space.
Oval, Rounded or Umbrella Shape.
Has Deciduous foliage.
Height: 30 - 70 feet.
Width: 30 - 50 feet.
Growth Rate: 24 Inches per Year.
Longevity Greater than 150 years.
Leaves Elliptic and Lobed, Glossy Medium Green, Gold or Orange, 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 Black or Dark Gray, Blocky or Furrowed.
Shading Capacity Rated as Moderately Dense in Leaf.
Shading Capacity Rated as Moderate out of Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones 5 - 7, 9 and 14 - 21.
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 Not Suited.
Pests & Disease Information
Resistant to Verticillium. Susceptible to Goldspotted Oak Borer, Insect Galls, Carpenterworm, California Oak Moth, Pacific Oak Teig Girdler, Oak Pit Scales, Gall Wasp and Scales, Sudden Oak Death, Anthracnose, Oak Root Rot, Brown Rot, Annosus Root Disease, Mistletoe, Powdery Mildew 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.
Desirable Wildlife Plant.
Attracts Birds and Squirrels.
Cite this tree:
SelecTree. "Quercus kelloggii Tree Record." 1995-2018. Feb 24, 2018.
< https://selectree.calpoly.edu/tree-detail/quercus-kelloggii >