Description
Scientific Name: Alnus incana ssp. tenuifolia
Anchor your streambanks and wet ground with Mountain Alder (Alnus incana ssp. tenuifolia), a fast-growing native shrub to small tree found along waterways throughout British Columbia. This hardy pioneer species thrives where many plants struggle and quickly establishes cover on disturbed and moist sites.
Alder is well suited to the streamsides, floodplains, and seepage areas of Interior BC. Its oval, doubly toothed leaves, small woody cones, and dense root system make it a workhorse for watershed restoration, bank stabilization, and reclaiming difficult ground.
Growing naturally along rivers, creeks, and wetland margins, this resilient species fixes nitrogen in the soil, improving conditions for the plants that follow and building healthier, more diverse riparian systems.
Features
- Native to British Columbia and much of Canada
- Fast-growing pioneer for disturbed and moist sites
- Fixes nitrogen and improves soil fertility
- Small persistent cones provide winter interest
- Excellent for streambank and slope stabilization
- Supports birds, pollinators, and beneficial insects
- Ideal for watershed and riparian restoration
Growing Information
Mature Height: 4 to 10 m (13 to 33 ft)
Spread: 3 to 6 m (10 to 20 ft)
Light Requirements: Full sun to partial shade
Soil Requirements: Moist to wet, tolerates poor and disturbed soils
Moisture Requirements: Moderate to high
Hardiness Zone: 2 to 7
Ecological Benefits
Mountain Alder fixes atmospheric nitrogen through a partnership with Frankia bacteria in its root nodules, enriching the soil and helping other native plants become established on disturbed ground. Its dense roots stabilize streambanks and reduce erosion, while its seeds, catkins, and cover provide food and shelter for birds and small wildlife. This species is a cornerstone of riparian and watershed restoration.
Please note: As a native plant, size and appearance may vary depending on the season and stage of growth.
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