Description
Quercus kelloggii typically grows from 9-25 m (30-80 ft) in height and from 0.3-1.4 m (1-4.5 ft) in diameter. Large trees may exceed 36 m (120 ft) in height and 1.6 m (5 ft) diameter. The species also grows in shrubby scrub-oak form on poor sites. In open areas the crown is broad and rounded, with lower branches nearly touching the ground or forming a browse line. In closed stands, the crown is narrow and slender in young trees and irregularly broad in old trees. Trunks are usually free of branches on the lower 6-12 m (20-40 ft) in closed stands. Trunks are often forked, and usually decayed and hollow in older trees. The bark is thin and smooth in young trees, becoming thick, ridged, and plate-like with age. This oak grows from one to several vertical roots which penetrate to bedrock, with large, laterally spreading roots extending off from vertical ones. It also has a number of surface roots.
Acorns are relatively large in this species, from 2.5-3 cm (1-1.2 in) long and 1.5-1.8 cm (0.6-0.7 in) wide. The deeply lobed leaves are typically 10-20 cm (4-8 in) long. While individual trees generally have a lifespan between 100 and 200 years, California black oak can live up to 500 years of age.
The tree reproduces when its acorns sprout to form seedlings. It also reproduces vegetatively with new growth sprouting from the root crown after the tree is top-killed by wildfire, logging, frost, or other events.
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