Andean alder
Alnus acuminata
A fast nitrogen-fixing tree that shades and feeds a highland food forest.
Hardiness: zones 8 to 11
Light: full sun
Size: about 70 ft tall, 30 ft wide
From: Mountains from Mexico to Argentina
Here: Too tender to overwinter outdoors on the Lake Erie shore (zone 6b to 7a): grow it in a pot and bring it in, or treat it as an annual.
Good for: fixing nitrogen in the soil, mulch and biomass.
Native to: Andean highlands, Tropical South America. Hardy in zones 8 to 11.
The story
Andean alder climbs the mountains from Mexico to Argentina, up to 10,000 feet. Highland farmers plant it along field edges and stream banks because it grows fast, fixes nitrogen and holds steep soil.
Planting
Sun and moist soil in a cool highland or mild frost-free climate.
Growing
Coppice or pollard it for poles and firewood; it resprouts readily.
Harvest and use
Shade for coffee and pasture, leaf litter that feeds the soil, and quick timber.
What to watch for
Not for hot lowlands or hard frost.
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More native and wild plants
General guidance, not professional advice. Conditions vary by yard and year; for local specifics ask your county extension office. Never eat a wild plant you cannot identify with certainty. Traditional uses are shared as history, not medical advice. © 2026 Sean Priest · Irie Orchard. Terms & credits · Privacy · Home