Plant Data Sheet


Species (common name, Latin name)

Mock-orange, Philadelphus lewisii



From B.C. and Cascade Mountains of Oregon and Washington to northern California, eastward to Montana (Rose)


Climate, elevation

Low to middle elevation; sea level to 2100m (Pojar) (Rose)


Local occurrence (where, how common)

Southern Puget Sound region (Pojar)


Habitat preferences

Wide range of habitats; open forest with moist fertile soils to brushy areas on dry, rocky soils; often riparian habitats (Pojar) (Rose)


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

Early to mid-seral species (Tirmenstein)


Associated species

Corylus cornuta, Holodiscus discolor, Toxicodendron diversilobum, Rosa gymnocarpa, and Mahonia aquifolium (Tirmenstein)


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

Seed and vegetative (Rose)


Collection restrictions or guidelines

Fruit matures in late summer. Take softwood cuttings in June and July. Collect hardwood cuttings in fall or spring (Rose)


Seed germination (needs dormancy breaking?)

Crush dried capsules and pass them through an aspirator to get seeds. Stratify at 5°C for eight weeks followed by 22-26°C. Put softwood cuttings in 1000ppm IBA. Put hardwood cuttings in 2500-8000ppm IBA (Rose)


Recommended seed storage conditions

Seed not planted in the fall can be sown without any pre-treatment, or cold-stratified for eight weeks at 41°F (Leigh)


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

Seeds are numerous and can be sown directly on-site. Can be grown from root suckers transplanted from salvage sites. (Leigh)


Soil or medium requirements (inoculum necessary?)

Put in peat:perlite (1:1) medium and mist-softwood; place 15cm deep into sandy soil –hardwood (Rose)


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

Plants sold in nurseries may not be from local region. 6-36” seedlings, 12-36” transplants (Leigh) (4th Corner Nursury)


Recommended planting density

Minimum: 692 per acre; Maximum: 1200 per acre (Vegspec)


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

Fall plantings should be mulched (Rose)


Normal rate of growth or spread; lifespan

Moderate; height when mature: 12ft. Lifespan: moderate (Vegspec)


Sources cited


Corner Nurseries.; May 6, 2003.


Leigh, Michael. Grow Your Own Native Landscape. Native Plant Salvage Project, WSU Cooperative Extension-Thurston County. Revised ed. June 1999.


Pojar, Jim and Andy MacKinnon. Plants of the Pacific Northwest Coast-Washington, Oregon, British Columbia and Alaska. B.C. Minisrty of Forest and Lone Pine Publishing. 1994.


Rose, Robin, Caryn Chachulski, and Diane Haase. Propagation of Pacific Norhtwest Native Plants. Oregon State University Press, Corvallis, OR. 1998.


Tirmenstein, D. 1991. Philadelphus lewsii. In: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (2003, May). Fire Effects Information System, [Online]. Available: May 6, 2003.


VegSpec. Phil Smith, Project Manager., USDA, Natural Resource Conservation Service. May 6, 2003.



Data compiled by (student name and date)

Scott Olmsted; 050603