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Quercus douglasii (Blue oak) on an arid hill near San Miguel (1914). California chaparral and woodlands habitat , in northern San Luis Obispo County, California.

Photo: Unknown author Unknown author (Public domain), via Wikimedia Commons

Fruit & ediblelow water

Blue Oak

Quercus douglasii

Blue Oak (Quercus douglasii) is a landscape plant valued for its form and structure as much as its bloom. It reaches roughly 60 ft at maturity and blooms in spring. Match it to full sun to part shade and let it go dry between waterings once it is established. One caveat: like any plant, its published range is a guideline, not a guarantee, for the specific microclimate of your yard. Given a spot that matches its light and water needs, it is a dependable, low-drama addition to the yard.

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Hardiness range

A hardiness zone is not on file for this plant yet, and a ZIP-level fit check is not available for it.

How it does in your yard

HabitNot recorded
Hardiness zoneNot recorded
Mature heightAbout 60 ft
Waterlow
Bloom periodSpring
Native to the USNot recorded
Toxicitynone

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Questions

Is Blue Oak native to the United States?

USDA PLANTS data does not record Blue Oak as native to the United States.

What USDA hardiness zone does Blue Oak need?

A minimum hardiness zone is not on file for Blue Oak yet.