Grey alder (Alnus incana)
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The grey alder is a small to medium-sized tree reaching 10–20 meters, valued for its hardiness and ability to rapidly colonize difficult sites. It has a conical, rather sparse crown that lets light through and fits naturally into mountain and submontane landscapes.
The leaves are oval, matte, light green, and well adapted to cooler climates. The trunk is light grey, smooth to slightly fissured.
Natural range
The grey alder is native to northern and central Europe, where it grows in:
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mountain and submountain forests
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river valleys
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moist to very wet habitats
It is a typical tree of cold regions, forming a natural part of floodplains, waterlogged slopes, and riparian vegetation.
Recommended uses
Thanks to its ecological traits, it has wide application in challenging environments:
✔ plantings on slopes — its dense roots stabilize terrain exceptionally well
✔ mountain and cold climates, where other species struggle
✔ reclamation of degraded and nutrient-poor soils
✘ unsuitable for overheated urban areas — it does poorly in heat and drought
It is an ideal species for soil restoration and landscape revitalization.
When to plant
Sowing can begin:
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in autumn, when natural stratification occurs, or
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in spring, if seeds were stored over winter
Both periods support healthy germination.
Growing conditions
The grey alder is tolerant and undemanding, but has specific preferences:
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requires moist soils, ideally with sufficient groundwater or surface water
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thrives in acidic environments
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highly cold-resistant — one of the most reliable species for mountain regions
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cannot withstand long-term drought or extreme heat
In moist conditions, it grows quickly and reliably.
Ecological benefits
The grey alder is an important pioneer species:
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improves soil quality — thanks to symbiotic bacteria it fixes nitrogen
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stabilizes eroding slopes and prevents runoff
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supports biodiversity of wet and cool habitats
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is crucial for regenerating disturbed sites such as landslides, mined areas, or erosion-affected landscapes
It is an ideal tree for ecological projects, reclamation, and restoration of wetland and mountain ecosystems.
