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Products > Quercus agrifolia
 
Quercus agrifolia - Coast Live Oak
   

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Habit and Cultural Information
Category: Tree
Family: Fagaceae (Oaks)
Origin: California (U.S.A.)
Evergreen: Yes
Flower Color: Insignificant
Bloomtime: Spring
Height: 40-60 feet
Width: 40-50 feet
Exposure: Full Sun
Summer Dry: Yes
Deer Tolerant: Yes
Irrigation (H2O Info): Low Water Needs
Winter Hardiness: <15 F
Quercus agrifolia (Coast Live Oak) - Coast live oak is native to California and Baja. This beautiful drought-resistant, evergreen tree, ranges in height from 20 to 70 feet and in diameter from 1 to 4 feet. The bark of young trees is smooth. With age, it develops deep furrows, ridges, and a thick bark. The inner bark and cork layers are thick. Open-grown crowns are broad and dense, with foliage often reaching the ground. In open areas trunks are usually 4 to 8 feet tall; at this height, primary branches originate and grow horizontally. Trees in dense stands generally have irregular crowns and few lower branches. In closed stands trunks may be branchless up to 20 feet high, where several branches extend diagonally upward. Coast live oak stands are typically from 40 to 110 years old, individual trees may live over 250 years. Coast live oak occurs in a Mediterranean climate characterized by mild, wet winters and hot, dry summers. Coast live oak begins flower and fruit production during stem elongation in the spring. Flowering of coast live oak is triggered by warm temperature. In late spring new growth emerges and sheds all the foliage at the same time. The root system consists of a deep taproot that is usually nonfunctional in large trees. Several deep main roots may tap groundwater if present within approximately 36 feet of the soil surface. Coast live oak develops extensive horizontal root branches and surface-feeding roots. Tree roots in southwestern California are associated with mycorrhizae that aid in water uptake during the dry season. Plant in full sun to partial shade. Cold hardy to <15 F.  This description is based on research and observations of this plant as it grows in our nursery, in our nursery garden and in other gardens that we visit. We also incorporate comments received and appreciate getting feedback of any kind from those who have any additional information about this plant, particularly if they disagree with what we have written or if they have additional cultural tips that would aid others in growing Quercus agrifolia.
 
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