SelecTree: Tree Detail
Photo Locations: Santa Barbara Botanic Garden - Santa Barbara, CA and Rancho Santa Ana Botanic Gardens - Claremont, CA
Utility friendly tree.
Foothill Ash is a commonly occuring native riparian habitat shrub or small tree. It is sometimes used as a garden tree, and when the foliage canopy is pruned up to expose the trunks, it makes an attractive multi-trunk tree or garden specimen. The showy flower clusters in late spring make it useful as a flowering accent tree in a native garden setting. Its height rarely exceeds 25'.
Native to California.
Trees may be referred to as male or female.
A Fraxinus dipetala in Lake County is registered as a California Big Tree. It measures 32 feet high, with a trunk circumference of 39 inches and a crown spread of 34 feet.
Additional Common Names
FOOTHILL ASH, CALIFORNIA ASH, TWO-PETAL ASH
Has Deciduous foliage.
Height: 20 - 25 feet.
Width: 15 - 20 feet.
Growth Rate: 24 Inches per Year.
Longevity 40 to 150 years.
Leaves Pinnately Compound Odd, Blue Green or Medium Green, Gold, Deciduous.
Flowers Showy. White. Flowers in Spring. Has either male or female flowers (dioecious). Trees may be sold as male or female.
Yellow or Mostly Green Winged Seed, Medium (0.50 - 1.50 inches), fruiting in Summer or Fall.
Bark Light Gray, Fissured.
Shading Capacity Rated as Moderately Dense in Leaf.
Shading Capacity Rated as Moderately Low out of Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones 7 - 24.
USDA Hardiness Zones 7 - 10.
Exposure Full Sun to Partial Shade.
Moist to Dry Soil.
Clay, Loam or Sand Texture.
Highly Acidic to Slightly Alkaline Soil pH.
Seaside Tolerance is Good in Mild Zone.
Pests & Disease Information
Susceptible to Scales, Root Rot, Sooty Mold and Verticillium.
Health, Safety & Environmental Concerns
Branch Strength Rated as Medium Strong.
Root Damage Potential Rated as Low.
Allergy Health Hazard.
Biogenic Emissions considered Low.
Fire Resistance is Favorable.
Desirable Wildlife Plant.
Not Deer Palatable.
Special Uses & Values
Cite this tree:
SelecTree. "Fraxinus dipetala Tree Record." 1995-2020. Feb 27, 2020.
< https://selectree.calpoly.edu/tree-detail/fraxinus-dipetala >
SelecTree Nursery Connection Map
Cal Poly / ESRI