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California Ash
Fraxinus dipetala
About California Ash (Fraxinus dipetala) Nurseries Show All Photos Fraxinus dipetala (California Ash or Two-petal Ash) is a species of ash in the Oleaceae (Olive) family native to northwestern Arizona, California, southern Nevada, and Utah, and northern Baja California. In California it is found in the Coast Ranges, Sierra foothills and Peninsular Range at elevations of 100-1,300 meters. It is a deciduous shrub or small tree growing to 7 meters tall, with cylindrical to four-angled stems. The leaves are 5-19 centimeter long, light to dark green, with three to seven (rarely nine) leaflets 1-7 centimeter long, thick, and serrated along the margins. The flowers have two white lobe-shaped petals 2.5-4 millimeter long, and are sweetly scented, hanging in fluffy clusters; unlike many ashes, they are bisexual, not dioecious. The fruit is a long, flat samara 2-3.2 centimeter long and 5-9 millimeter broad, green when immature and hanging in bunches.
Plant Description
Plant Type

Max. Height
23 ft (7 m)

Max. Width
15 ft (4.6 m)

Fragrant - Pleasant

Winter Deciduous

Flower Color
Yellow, White

Flowering Season

Native Status

Natural Setting
Site Type

Sun, Part Shade

Elevation ?
36' - 6571'

Annual Precip. ?
4.2" - 73.0"

Summer Precip. ?
0.14" - 2.35"

Coldest Month ?
34.3° F - 55.2° F

Hottest Month ?
59.0° F - 83.1° F

Humidity ?
0.75 vpd - 34.79 vpd

Soil Description
Tolerates a variety of soils including clay and decomposed granite

Soil PH
5.9 - 8.2

Soil Toxicity Tolerance
Tolerates Serpentine Soil

Fast, Medium, Slow

Cold Tolerance(° F)
Tolerates cold to 15° F

Sunset Zones ?
7*, 8*, 9*, 14*, 15*, 16*, 17, 18*, 19*, 20*, 21*, 22*, 23*, 24

Companion Plants
Use with other woodland shrubs such as Manzanita (Arctostaphylos manzanita or viscida), Spice Bush (Calycanthus occidentalis), Ceanothus sp., Redbud (Cercis occidentalis), Oaks (Quercus sp.), and Currant/Gooseberry (Ribes sp.)

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 it as host plant

Landscaping Information
Ease of Care
moderately easy

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

Moderately Popular

Max. Summer Water ?
1x/month, 2x/month
No Summer Water
Keep moist

Organic with Rocks

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

Common uses
Bank Stabilization, Bird Gardens

Nursery Availability
Commonly Available

Other Names
Botanical Names
Fraxinus jonesii

Common Names
Flowering Ash, Foothill Ash, Two-petaled Ash

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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