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Oregon Ash
Fraxinus latifolia
About Oregon Ash (Fraxinus latifolia) Nurseries Show All Photos Fraxinus latifolia (Oregon ash) is a member of the Oleaceae (Olive) family native to western North America on the west side of the Cascade Range from southwestern British Columbia south through western Washington and western Oregon to central California. It can grow to 25 meters in height, with a trunk diameter of 30-80 centimeter, and it is typically larger in the northern part of its range. Trees can live to 250 years; young trees are fast growing, slowing down in maturity. It is usually found in riparian corridors within forest, woodland, chaparral, or grassland. The compound leaves are pinnate, 12-33 centimeter long, with 5-9 leaflets, each leaflet ovate, 6-12 centimeter long and 3-4 centimeter broad, and often show signs of disease and brown rot, even on otherwise healthy plants. The inconspicuous flowers are dioecious, meaning that male and female parts are contained in separate flowers. The fruit is a samara, 3-5 centimeter long including the wing, and not usually produced until the tree reaches 20-30 years of age. It is also a vigorous stump-sprouter.
Plant Description
Plant Type

Max. Height
35 - 82 ft (10.7 - 25 m)

Max. Width
30 ft (9.1 m)


Growth Rate
Fast, Moderate

Winter Deciduous

Flower Color

Flowering Season

Native Status

Natural Setting
Site Type
Slopes and streambanks sea level to over 5,000 ft.

Sun, Part Shade

Elevation ?
6' - 9372'

Annual Precip. ?
6.1" - 117.4"

Summer Precip. ?
0.15" - 4.04"

Coldest Month ?
28.9° F - 56.0° F

Hottest Month ?
49.9° F - 84.1° F

Humidity ?
0.01 vpd - 35.01 vpd

Soil Description
Typically found in poorly drained, moist bottom land with deep soil rich in humus


Sunset Zones ?
1, 2, 3, 4*, 5*, 6*, 7*, 8*, 9*, 14*, 15*, 16*, 17, 18, 19, 20, 21, 22, 23, 24

Companion Plants
Use with other wetland-riparian trees and shrubs such as Maples (Acer sp.), Alders (Alnus sp.), Dogwood (Cornus sp.), California Walnut (Juglans californica or hindsii), Sycamore (Platanus racemosa), Cottonwood (Populus sp.), Currant/Gooseberry (Ribes sp.), wild Rose (Rosa sp.), and wild grape (Vitis californica or girdiana). Also works well with various wetland grasses and grass-like plants such as Sedges (Carex sp.), Spikerush (Eleocharis sp.), Rushes (Juncus sp.), and Alkali Sacaton (Sporobolus airoides)

Wildlife Attracted
Butterflies are attracted to plants in the Fraxinus genus, including the Pale Swallowtail, Two-tailed Swallowtail, and Western Tiger Swallowtail butterflies which use these as host plant

Landscaping Information
Ease of Care
Very Easy

Water Requirement ?
Low, Moderate - High
Extremely Low
Very Low
Moderate - High

Propagation ?
For propagating by seed: 3 mos. stratification.

Common uses
Bird Gardens

Nursery Availability
Commonly Available

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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