Plant Data Sheet
Silky lupine, Lupinus sericeus, Pursh
Photo credit: Wildflowers of
Silky lupine occurs
east of the
Silky lupine has been
found to 10,000 feet (3,030 m) elevation in
East of the Cascades, silky lupine occurs as a significant component of the herbaceous layer in ponderosa pine savannas, shrub-steppe, and grassland communities. (FEIS database)
Silky lupine occurs in a range of habitats including grasslands, sagebrush, mountain brush, and aspen and conifer forests. Silky lupine is found on dry, rocky sites on gentle to steep slopes and in open woods. (FEIS database)
Seral species. Tolerant of partial shade but prefers full sun. Occurs in open, climax ponderosa pine systems throughout its range
and in openings within late-seral Douglas-fir forests
Some species commonly associated with silky lupine include Gambel oak (Quercus gambelii), common snowberry (Symphoricarpos albus), ninebark (Physocarpus malvaceus), serviceberry (Amelanchier spp.), mountain-mahogany (Cercocarpus spp.), arrowleaf balsamroot (Balsamorhiza sagittata), western yarrow (Achillea millefolium), heartleaf arnica (Arnica cordifolia), pinegrass (Calamagrostis rubescens), bluebunch wheatgrass (Pseudoroegneria spicata), Sandberg bluegrass (Poa secunda), Idaho fescue (Festuca idahoensis), prairie junegrass (Koeleria cristata), and sedges (Carex spp.). (FEIS database)
May be collected as:
Collect seedpods when they turn tan, before dehiscence. Pods are generally mature from July into August depending upon location. (FEIS database; Hosokawa, et al. 2001)
Silky lupine seeds are protected by a hard seed coat and need germination pretreatments of scarification and stratification. One method for achieving germinable seeds is as follows:
Seeds are placed in a hot water scarification bath and allowed to cool overnight to imbibe. Seeds are wrapped in moist paper towels and placed under refrigeration at 3 degrees C for a 30-day stratification. (Hosokawa, et al. 2001)
Seed life (can be stored, short shelf-life, long shelf-life)
Seeds can remain viable from 20 to 60 years in sealed containers at 3 to 5 C. (Hosokawa, et al. 2001)
Dry seeds in sealed containers stored at 3 to 5 C.
Soil or medium requirements
Seeds should be inoculated with Rhizobium specific to Lupinus spp. and can be planted for container production in a soilless mix of peat, perlite, vermiculite and sand with a controlled release fertilizer. (Hosokawa, et al. 2001)
Silky lupine grows best on sites with dry, sandy, loamy, sandy-loam, and clayey-loam soils. (FEIS database)
Silky lupine does not transplant well, so direct seeding after inoculation with Rhizobium is recommended. If container grown seedlings are used, they should be transplanted the first year if possible and can be installed in the spring or fall. (Hosokawa, et al. 2001)
No data found.
Care requirements after installed
Water regularly at least through first growing season.
Container grown seedlings are large enough for transplanting after 1 growing season.
F. and C. T. Dyrness. 1973. Natural
L. and A. Cronquist. 1973. Flora of the
D. Wick, and T. Luna. 2001. Propagation protocol for production of
container Lupinus sericeus Pursh. plants (172 ml conetainers);
Data compiled by Anne G. Andreu,