California black oak is distributed along foothills and lower mountains of California and western Oregon. Distribution and habitat Ĭalifornia black oak is a deciduous tree growing in mixed evergreen forests, oak woodlands, and coniferous forests. 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. The tree reproduces when its acorns sprout to form seedlings. While individual trees generally have a lifespan between 100 and 200 years, California black oak can live up to 500 years. The leaves are typically 10–25 cm (4– 9 + 3⁄ 4 in) long and deeply lobed, usually into seven portions they are red and velvety when young, turning yellow-green then orange-brown in autumn. Īcorns are relatively large in this species, from 2.5–4 centimeters (1– 1 + 1⁄ 2 in) long and 1.5–1.8 cm ( 1⁄ 2– 3⁄ 4 in) wide. This oak grows from one to several vertical roots which penetrate to bedrock, with large, laterally spreading roots extending off from vertical ones. The bark is thin and smooth in young trees, becoming thick, ridged, plate-like, and blackish with age. Trunks are often forked, and usually decayed and hollow in older trees.
BLACK OAK ACORN FREE
Trunks are usually free of branches on the lower 6–12 m (20–39 ft) in closed stands. In closed stands, the crown is narrow and slender in young trees and irregularly broad in old trees. In open areas, the crown is broad and rounded, with lower branches nearly touching the ground or forming a browse line. The species also grows in shrubby scrub-oak form on poor sites. Large trees may exceed 36 m (118 ft) in height and 1.6 m (5 ft 3 in) diameter, with the record holder measuring 38 m (124 ft) tall and 2.7 m (9 ft) thick (in the Siskiyou National Forest in Oregon).
Quercus kelloggii typically grows from 9–25 meters (30–82 feet) in height and from 0.3–1.4 m (1– 4 + 1⁄ 2 ft) in diameter.
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