White Alder Tree Seeds

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About & Species

White Alder
(Alnus rhombifolia)

The White Alder is a large pyramidal-oval tree reaching 15 to 80 feet in height with dark green foliage. The Largest reported tree is 112 feet. The White Alder is found from the Pacific Coast of Baja California up the coast to San Francisco Bay and as far North as Oregon and Southern British Columbia.  

Uses: Shade tree. Native Americans used the White Alder to make a red dye for their baskets.

Soil Type: Found in rocky or gravelly soils along the sides of streams. Prefers loamy and clay soils and can grow well in nutrient-poor soils.

Zones: 5 to 8

Germination Range: 30-50%

Stratification Requirement: 30-60 days cold moist stratification.

Indoor Planting: If your seeds require stratification or scarification – do the recommended pretreatment before planting indoors. Planting Instructions: Fill a container with seed starting mix to about ½ inch from the top. Place your seeds 1 inch to 1 ½ inches below the soil surface. Gently water your seeds to keep moist, not soaking wet. Heat & humidity is critical for germination. Germination may occur in 1 week or as long as 3 months (depending on the species). Place the seed container on a heat mat under growing light(s). Keep your growing lights on 14 hours per day. Keep your heat mat on 24 hours per day. Once your seeds germinate, move each seed into its own container under the growing lights and on the heat mat. Keep your seedlings indoors for 2-3 months before transplanting outdoors in the spring (May to June).

Outdoor Planting: If your seeds do not require stratification: the best time to plant tree and shrub seeds outdoors is after the last frost in your area (spring). In the Northern states – the best time to plant seeds outdoors is from May to June. If your seeds require pretreatment: you should plant your seeds outdoors before the ground freezes in your area (late September to early November). Your seeds will naturally stratify during the cold winter. Germination usually occurs in May or during the spring season.