Oregon ash, Fraxinus latifolia




     Western regions of Washington, Oregon, and California (5)


Climate, elevation

     Moist, moderate climate; low elevations (3)


Local occurrence (where, how common)

     Often on the edges of streams, lakes, or in other areas that are occasionally flooded (1)


Habitat preferences

     Moist to wet soils (1)

     Full sun to partial shade (2)


Plant strategy type/successional stage (stress-tolerator, competitor, weedy/colonizer, seral, late successional)

     Stress-tolerator: Oregon ash can tolerate a significant amount of inundation and fluctuating water levels (most tolerant early in the growing season) (4)

     Can form monotypic stands or mixed stands with black cottonwood and red alder (2)


Associated species

     Slough sedge (Carex obnupta), red alder (Alnus rubra), red osier dogwood (Cornus sericea), willows (Salix spp.), black cottonwood (Populus balsamifera spp. trichocarpa), pacific ninebark (Physocarpus capitatus) (1)


May be collected as: (seed, layered, divisions, etc.)


     Salvaged seedlings


Collection restrictions or guidelines

     Collect seed from August to October (2)

     Salvage seedlings under four feet tall in late winter or early spring before bud break (keep roots covered and moist until re-planting) (2)


Seed germination (needs dormancy breaking?)

     Three months cold stratification (2)


Seed life (can be stored, short shelf-life, long shelf-life)

     Best if planted immediately after collection

     Can be stored if necessary


Recommended seed storage conditions

     Best if planted immediately after collection

     Seeds can be stored by air-drying them thoroughly (2)


Propagation recommendations (plant seeds, vegetative parts, cuttings, etc.)

     Sow seeds as soon as possible after collection into garden beds or trays (2)

     Mulch in the fall, and remove carefully in the spring (2)

     Seedlings should be installed immediately on site after uprooting (4)


Soil or medium requirements (inoculum necessary?)

        Soil with relatively high water holding capacity


Installation form (form, potential for successful outcomes, cost)

     From seed: outplant seedlings after 1-2 years (2)

     Salvaged seedlings: plant immediately, make sure to keep roots moist and covered in transplanting process (4)


Care requirements after installed (water weekly, water once etc.)

     Soil should be kept moist


Sources cited


1.      Guard, B. Jennifer. Wetland Plants of Oregon and Washington. Lone Pine Publishing. Vancouver, B.C. 1995.


2.      Leigh, M. 1999. Grow Your Own Native Landscape: A guide to identification, propagation, and landscaping with western Washington native plants. Washington State University Cooperative Extension.


3.      Pojar, J. and A. MacKinnon. Plants of the Pacific Northwest Coast-Washington, Oregon, British Columbia and Alaska. B.C. Ministry of Forest and Lone Pine Publishing. 1994.


4.      Stevens, M. and R. Vanbianchi. 1993. Restoring Wetlands in Washington: A Guidebook for Wetland Restoration, Planning and Implementation. Washington State Department of Ecology Publication 93-17, 110 p.

5.      USDA, NRCS. 2002. The PLANTS Database, Version 3.5 (http://plants.usda.gov). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.



Data compiled by:

Crystal Elliot, 4/22/03