Valley oak
Quercus lobata
The great oak of California valleys; deep roots, little summer water once settled.
Hardiness: zones 7 to 10
Light: full sun
Size: about 70 ft tall, 70 ft wide
From: California
Drought-hardy once established
Here: Hardy in the Lake Erie shore climate (zone 6b to 7a), so it can live outdoors in the ground.
Good for: wildlife, butterfly and moth caterpillars.
Native to: California. Hardy in zones 7 to 10.
The story
Valley oak is the largest oak in North America and grows nowhere but California. Its acorns were a staple for dozens of California peoples, who stored them in granaries and leached the meal into soup, mush and bread.
Planting
Full sun and deep soil, ideally where the roots can reach groundwater. Plant an acorn or a very young tree in fall with the rains.
Growing
Water deeply but rarely for the first two or three summers, then stop. Established trees are harmed by summer irrigation.
Harvest and use
Huge shade, long sweet acorns for wildlife in fall, and a whole community of birds and insects.
What to watch for
Summer watering and paving over the roots are what kill old trees.
See if Valley oak fits your yard
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More native and wild plants
General guidance, not professional advice. Conditions vary by yard and year; for local specifics ask your county extension office. Never eat a wild plant you cannot identify with certainty. Traditional uses are shared as history, not medical advice. © 2026 Sean Priest · Irie Orchard. Terms & credits · Privacy · Home