Black Alder Tree Seeds

Black Alder (Alnus glutinosa) is a fast-growing deciduous tree native to Europe, western Asia, and northern Africa. It thrives in moist soils and is commonly found along rivers, wetlands, and low-lying areas. Known for its ability to improve soil fertility by fixing nitrogen, Black Alder is an excellent choice for reforestation, erosion control, wildlife habitat, and ornamental landscaping. Its glossy green leaves, attractive bark, and small woody cones provide year-round interest, while its rapid growth makes it a valuable tree for restoration projects.

Botanical Information

• Botanical Name: Alnus glutinosa
• Common Name: Black Alder
• Plant Type: Deciduous Tree
• Mature Height: 40-70 feet
• Mature Spread: 20-40 feet
• Growth Rate: Fast
• USDA Hardiness Zones: 3-7
• Light Requirements: Full Sun to Partial Shade
• Soil Preference: Moist, fertile, well-drained to wet soils
• Native Range: Europe, Western Asia, Northern Africa

Germination Instructions

Black Alder seeds germinate best after a period of cold moist stratification to simulate natural winter conditions.

1. Cold moist stratify the seeds for 30-60 days at approximately 34-40°F (1-4°C).
2. Sow the stratified seeds on the surface of a moist, well-draining seed-starting mix.
3. Lightly press the seeds into the soil, but do not bury them deeply, as light helps encourage germination.
4. Use a humidity dome to maintain consistent moisture during germination.
5. Keep the growing medium evenly moist and maintain temperatures between 65-75°F.
6. Germination typically occurs within several weeks after stratification under favorable conditions.

Growing Information

• Prefers consistently moist or wet soils and tolerates seasonal flooding.
• Performs best in full sun but will tolerate partial shade.
• Fixes atmospheric nitrogen, improving soil quality naturally.
• Excellent for streambanks, ponds, wetlands, erosion control, and reclamation projects.
• Produces small woody cones that remain on the tree through winter and add ornamental interest.
• Provides food and shelter for birds and other wildlife.

Seed Quantities Available

• 1 oz. - 25,000 Seeds
• 1/4 lb. - 100,000 Seeds
• 1 lb. - 400,000 Seeds