Helping You Become a More Successful Gardener
James H. Schutte
This entry has yet to be reviewed and approved by L2G editors.
Fast growing when young, the tall, narrow shape of the Oregon ash is not an especially ornamental shade tree. The American Northwest's only native ash species, its range is from Washington's Puget Sound southward to the Sierra Nevada and Great Valley of central California. It grows alongside woodland streams. The yellow fall foliage is one pretty attribute, as is the furrowed grayish brown bark that is ridged in white.
The compound leaves emerge light green and fuzzy in spring. They have seven to nice oval leaflets with crinkled veins and later smooth surfaces, the terminal leaflet is larger. In fall the foliage turns shades of yellow. The small flowers emerge before the leaves in spring and are dioecious, which means that trees are either fully male or female. The clusters of male flowers are yellowish while female flowers are green. Only the female trees produce winged fruits, called samaras. These are borne in clusters and are green when young and ripen to a tan.
Grow Oregon ash in full sun and well-drained soil that is evenly moist. While dormant in winter it can tolerate ground flooding and in natural periods of drought irrigation is not necessary. Oregon ash can be used as a shade tree, but its overall form doesn't make it especially ornamental. Male trees are preferred for urban areas because they do not produce the messy drop of fruits which will be eaten by birds and squirrels.
8 - 6
6 - 9
3a, 3b, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Full Sun, Partial Sun
40'-80' / 12.2m - 24.4m
30'-45' / 9.1m - 13.7m
Spring, Late Spring
Northwestern United States, California
Clay, Loam, Sand
Wet Site, Drought
Drought Tolerant, Average Water
Yellow Green, Light Green
Green, Light Green, Yellow Green
White, Brown, Gray
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