Alnus glutinosa Seeds | Black Alder
LATIN NAME: Alnus glutinosa
COMMON NAME: Black Alder, Common Alder
Plant Profile
Black Alder (Alnus glutinosa) is a medium-sized deciduous tree of the birch family (Betulaceae), native to Europe, western Asia and North Africa, where it thrives along rivers and in wet ground. It reaches 20-30 m, with rounded, glossy leaves, woody cone-like fruits and bark that darkens deeply with age. Its roots host nitrogen-fixing bacteria, and its timber resists rot under water, a property that built much of Venice.
Science & Biotechnology
The species features in the wider study of the Alnus group, and its traits make it a useful subject for work on germination biology, cultivation and ornamental selection. Its charcoal was also historically valued for gunpowder production, prized for burning at a particularly desirable rate for that specific purpose. Breeders and collectors still work with it, so well-kept seed remains available.
Uses & Benefits
In the garden, Black Alder earns its place in borders, containers and mixed plantings, and it also rewards growers who raise plants for cutting, drying or kitchen use. Its wood continues to see use in situations involving permanent or repeated wetting, where few other timbers perform as reliably. Once it has settled, the workload drops to almost nothing.
Alders heal land: their root nodules fix nitrogen in poor and wet soils, their bark is a traditional astringent and dye, and their cones scent winter wetlands.
Growing from Seed
Sow fresh seed of Black Alder under ordinary good conditions. A period of cold, moist stratification helps seed germinate evenly, after which it should be sown into a loose, consistently moist mix reflecting this species’ native wetland and riverside habitat. Bright light suits young seedling well, and this adaptable tree tolerates genuinely waterlogged conditions far better than most broadleaf species. Use a fine, free-draining seed compost, scatter the seed evenly, cover it lightly and hold it just moist in good light. When the young plants are big enough to handle, space them into pots or a nursery row and let them size up before their final move.
Our Take
Black Alder, Common Alder is the kind of plant that rewards a permanent spot. Sun, free drainage and a patient first year are all it really requires.
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