Plant Data Sheet
© Roy Andersen, http://www.royandersenphotography.com/workshops.html
Species: Rock clematis; Clematis columbiana
East side of Cascades from
Climate, elevation: Found in valleys to approximately 2,500 meters. (3)
Local occurrence: Open woods and talus slopes. Not abundant. (5)
Habitat preferences: Dry to moist soils in woods and thickets (3)
Plant strategy type/successional stage: Vine, twines around other plants. (5)
Associated species: Subalpine fir, Beargrass (2)
May be collected as: (seed, layered, divisions, etc.) Seed, Summer softwood stem cutting (2)
Collection restrictions or guidelines: Flowers bloom from June to July (1). Collect mature plumose achenes when they turn brown in late September and early October(2). Collect cuttings from healthy field plants in early June (2).
Seed germination: Outdoor stratification for five months. It must be uncovered, as covered seeds may not germinate (2).
Seed life: Two years (2)
Recommended seed storage conditions: No information available.
Propagation recommendations (plant seeds, vegetative parts, cuttings, etc.): Summer softwood stem cuttings were effective (2)
Soil or medium requirements: Deep, moist soil preferred (3)
Installation form: Plug (2)
Recommended planting density: No information available.
Care requirements after installed (water weekly, water once etc.): Gradually reduce irrigation prior to installation(2). Plant out in late spring or early summer, after last expected frosts. (3)
Normal rate of growth or spread; lifespan: Probably slow rate of spread as it is not particularly abundant anywhere. (5)
1. Washington Native Plant Society http://www.wnps.org/plants/clematis_columbiana.html
2. Native Plants Network http://www.nativeplantnetwork.org
3. Plants for a Future http://www.pfaf.org/database/plants.php?Clematis+columbiana
4. eFloras.org http://www.efloras.org
Wildflowers of the Pacific Northwest from
Data compiled by Deborah Brown, April 13, 2006