Plant Data Sheet
Species (common name, Latin name)
Mountain Alder, Alnus Incana
Near sea level to 3000 m.
typically found near streams, rivers, or springs on moist mountain slopes on poorly developed soils of cobbles, gravels, or sands which remain moist year round due to high water tables
Plant strategy type/successional stage (stress-tolerator, competitor, weedy/colonizer, seral, late successional)
Thinleaf alder is an early successional plant. It is a nitrogen fixer and has a high flood tolerance and thus improves soil fertility and stabilizes streambanks.
cottonwood, Maple, and
May be collected as: (seed, layered, divisions, etc.)
Seed - best sown in a cold frame as soon as it is ripe and only just covered.
Cuttings of mature wood can be taken as soon as the leaves fall in autumn, outdoors in sandy soil.
Seed germination (needs dormancy breaking?)
Requires cold stratification
Seed life (can be stored, short shelf-life, long shelf-life)
Seeds have a short shelf-life.
Propagation recommendations (plant seeds, vegetative parts, cuttings, etc.) Spring sown seed should germinate successfully so long as it is not covered. The seed should germinate in the spring as the weather warms up. When large enough to handle, prick the seedlings out into individual pots. The seedlings can either be planted out into their permanent positions in the autumn/winter, or they can be allowed to grow on in the seed bed for a further season before planting them
Soil or medium requirements (inoculum necessary?)
Poorly developed soils of cobbles, gravels, or sands which remain moist year round
Installation form (form, potential for successful outcomes, cost)
May be planted as seed, container, or bare root.
Recommended planting density
300-1200 per acre.
Care requirements after installed (water weekly, water once etc.)
Water daily for the first year.
Normal rate of growth or spread; lifespan
Rapid growth, thicket forming with short lifespan.
Propagation of Pacific Northwest Native Plants by Rose, Robin.; Chachulski, Caryn E. C.; Haase, Diane L., Corvallis Oregon State University Press, 1998.
Plants Database, http://plants.usda.gov/cgi_bin/topics.cgi
Data compiled by (student name and date)