Red Alder Tree Seeds | Western Alder | (Alnus rubra)

The fastest-growing hardwood of the Pacific Northwest. A soil builder that transforms land.

Alnus rubra, the Red Alder or Western Alder, is the dominant native hardwood of the Pacific Northwest and one of the most important ecological tree species in western North America, capable of rapid growth on disturbed, poor, or degraded soils where few other trees can establish. It is a pioneer species that colonizes landslides, clearcuts, and burned areas, enriching the soil through a symbiotic relationship with nitrogen-fixing bacteria in its root nodules, effectively fertilizing the landscape for the forest that follows. Native from Alaska to California, it forms pure stands along rivers, coastal plains, and disturbed forest edges, growing quickly into a medium-sized tree with smooth gray bark and a straight trunk prized for woodworking. If you are looking to buy Red Alder seeds or grow this foundational native species from seed, this is the tree that rebuilds ecosystems from the ground up.

• Fast-growing native hardwood capable of rapid establishment on disturbed or poor soils
• Fixes atmospheric nitrogen through root nodules, improving soil fertility naturally
• Native to the Pacific Northwest from Alaska to California, thriving in moist coastal climates
• Important pioneer species that prepares the landscape for long-term forest development
• Valuable wood used for furniture, cabinetry, and smoking foods due to its mild, sweet aroma

Things you probably did not know about the Red Alder

It improves soil so effectively that it can replace fertilizers in forest regeneration. Red Alder forms a symbiotic relationship with Frankia bacteria in its roots, allowing it to fix atmospheric nitrogen and deposit it into the soil. This process can add significant amounts of nitrogen annually, dramatically improving soil quality for other plants and making it one of the most important species in natural forest succession.

It is the primary hardwood used in Pacific Northwest furniture and cabinetry. Red Alder wood has a fine, even grain and a warm, light color that takes stain exceptionally well, often used as an affordable substitute for cherry. It machines easily and is widely used in cabinetry, millwork, and furniture throughout the region.

It plays a critical role in salmon stream ecosystems. Along rivers and streams, Red Alder contributes leaf litter that decomposes quickly and provides nutrients to aquatic food webs, supporting insects that feed juvenile salmon. Its roots also help stabilize streambanks and reduce erosion in sensitive riparian environments.

The wood is prized for smoking salmon and other foods. Red Alder wood produces a mild, slightly sweet smoke that has been traditionally used by Indigenous peoples and modern cooks alike for smoking fish and meats, especially salmon, where it enhances flavor without overpowering it.

Growing Details

• Botanical Name: Alnus rubra
• Stratification: Not required, but 30 to 60 days cold stratification may improve germination
• USDA Zones: 5 to 9
• Soil: Moist, well-drained to wet, tolerates poor and disturbed soils
• Light: Full sun
• Height: 40 to 80 feet
• Spread: 20 to 40 feet
• Growth Rate: Fast, 2 to 4 feet per year

Plant it where the soil needs improvement or where you want rapid shade and structure. In a few years it will transform the ground beneath it and set the stage for everything that follows.