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Quercus garryana
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Garry's Oak
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Quercus garryana

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About Garry's Oak (Quercus garryana) The Garry Oak (Quercus garryana), also known as Oregon White Oak or Oregon Oak, is a member of the Fagaceae family (Beeches, Chestnuts and Oaks). It has a range from the mountains of Los Angeles County northward to British Columbia, Canada, particularly in the foothills of the Siskiyou and Klamath Mountains, the Coast Ranges of Northern California, and of the west slope of the Cascades. It grows from sea level to 210 meter altitude in the northern part of its range, and at 300-1800 meter in the south of the range. There are three recognized varieties with largely overlapping ranges. The tree is named after Nicholas Garry, deputy governor of the Hudson's Bay Company, 1822-35. In the northerm part of its range it is an attractive tree, sometimes reaching 90 ft. but more often 50-60 ft. In the southern part of its range it is more often a shrub to 20 ft. It has large, lobed leaves which it drops in winter. It makes an excellent tree or shrub for mountain gardens and is important for wildlife.
Plant Description
Plant Type

Max. Height
20 - 90 ft (6.1 - 27.4 m)

Max. Width
30 ft (9.1 m)


Growth Rate
Moderate, Slow

Winter Deciduous

Flower Color
Yellow, Cream, Green

Flowering Season

Native Status

Natural Setting
Site Type

Sun, Part Shade

Elevation ?
20' - 14090'

Annual Precip. ?
11.5" - 136.9"

Summer Precip. ?
0.20" - 4.38"

Coldest Month ?
10.8° F - 52.2° F

Hottest Month ?
34.1° F - 76.7° F

Humidity ?
0.01 vpd - 28.16 vpd

Soil Description
Accepts a variety of soils but performs best in rich, loamy soil

Soil PH
5.0 - 7.0


Cold Tolerance(° F)
Tolerates cold to -5° F

Companion Plants
Works well with a number of other trees and large shrubs including Firs (Abies sp. and Pseudotsuga sp.), Madrone (Arbutus menziesii), Manzanita (Arctostaphylos sp.), Incense Cedar (Calocedrus decurrens), Ceanothus sp., Mountain Mahogany (Cercocarpus betuloides), Silk Tassel (Garrya sp.), Oceanspray (Holodiscus discolor), Pines (Pinus sp.), Redberry (Rhamnus crocea), Currant/Gooseberry (Ribes sp.) and Snowberry (Symphoricarpos albus). Understory plantings could include strawberry (Fragraria sp.), Iris sp., and Violets (Viola sp.)

Wildlife Attracted
Oaks in general are very important for wildlife, including insects, reptiles, amphibians, birds and mammals. Many insects are attracted to Oaks generally, including the following butterflies which use Oaks as host plant: California Sister, Propertius Duskywing, Mournful Duskywing, Golden Hairstreak, and Gold-Hunter's Hairstreak.

Landscaping Information
Ease of Care
Very Easy

Water Requirement ?
Extremely Low
Very Low
Moderate - High

Moderately Popular

Max. Summer Water ?
No Summer Water
Keep moist

Deep Organic

As with other oaks, best to prune during July or August, when the trees are not normally growing, and when the dry weather is less likely to support pathogens that may attack the wounds. As much as possible, avoid pruning large limbs as this exposes the tree to possible infection and can take many years to recover. Avoid over-thinning interior branches or "lion tailing."

Propagation ?
For propagating by seed: Fresh seeds sow in fall outdoors or stratify to hold for spring sowing. (USDA Forest Service 1974).

Common uses
Bank Stabilization, Deer Resistant, Bird Gardens, Butterfly Gardens

Nursery Availability
Commonly Available

Other Names
Common Names
Oregon White Oak

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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