Western Spiraea, Spiraea douglasii
Moist areas to water-logged soils (peat), full sun. Reportedly shade intolerant. Sea level to 6000 feet
Local occurrence (where, how common)
Moist areas, swamps, lake margins and damp meadows, sea level to subalpine. Coniferous forests.
Plant strategy type/successional stage (stress-tolerator, competitor, weedy/colonizer, seral, late successional)
It can be invasive, crowding out other native plants, especially in wetland areas. Occurs mostly in seral communities. Pioneer species in clearcut areas.
Juncus ensifolius, Carex vesicaria, C. sitchensis, C. obnupta, Epilobium glandulosum, Angelica genuflexa, Equisetum arvense, Veratrum californicum, Alnus viridis ssp. sinuata, Lonicera involucrata, Cornus sericea, Vaccinium caespitosum, Elymus glaucus, Blechnum spicant, Pteridium aquilinum, Achillea millefolium, Carex eurycarpa, Rosa woodsii, and Ribes lacustre.
May be collected as: (seed, layered, divisions, etc.)
Seed, hardwood and softwood cuttings, divisions.
Collection restrictions or guidelines
Bag seedheads to capture ripening seed. Allow pods to dry on plant; break open to collect seeds. Collect seed in the fall.
Seed germination (needs dormancy breaking?)
Fresh seed germinates easily without any pretreatment while dry seed may require one to two months of cold stratification. Seeds should be soaked for 24 hours before stratification in mesh bags in peat.
Seed life (can be stored, short shelf-life, long shelf-life)
Can be stored for at least one year.
Propagation recommendations (plant seeds, vegetative parts, cuttings, etc.)
Can be grown from seed, softwood hardwood cuttings, root cuttings, or division. Responds well to bottom watering.
Soil or medium requirements (inoculum necessary?)
100 percent peat.
Installation form (form, potential for successful outcomes, cost)
Rooted plants to 6' tall in containers; bareroot & cuttings 18"-24" tall
Plants 3+ feet on center, cuttings 2+ feet on center.
Care requirements after installed (water weekly, water once etc.)
Requires consistently moist soil; do not let dry out between waterings.
Normal rate of growth or spread; lifespan
Fast growing, to 3-6 feet tall and spreads easily, forming monocultures. Short-lived, less than 50 years.
Hudson, Shelley and Michael Carlson. Propagation of Interior
Rose, Robin et al. 1998. Propagation of
AllRefer.com Reference: http://reference.allrefer.com/
The Theodore Payne Foundation California Native Plant Library http://www.theodorepayne.org/gallery/glossary.htm
WSU Master Gardener Native Plant Guide: http://gardening.wsu.edu/nwnative/
Dave’s Garden: http://davesgarden.com
National Tree Seed Laboratory: USDA Forest Service: http://www.nsl.fs.fed.us/
Data compiled by:
April 27, 2006