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Red Alder

Alnus rubra, Betulaceae

Zones
3–7
Layer
Canopy
Lifespan
Perennial
Growth
Fast

Guild Roles

Shade ProviderDynamic AccumulatorNitrogen Fixer

Growing Conditions

Sun

Full Sun (optimal)Partial Sun (tolerated)

Water

ModerateHigh

Soil pH

5 – 7

Tolerances

Drought
Frost
Heat
Pest Resistance
Disease Resist.

Companion Plants

Honeycrisp AppleMalus domestica Honeycrisp
Nitrogen FixationWind Protection
McIntosh AppleMalus domestica McIntosh
Nitrogen FixationWind Protection
AsparagusAsparagus officinalis
Nitrogen Fixation
Beach PlumPrunus maritima
Nitrogen FixationWind Protection

Antagonistic Plants

Western RedbudCercis occidentalis

Red alder's rapid growth and dense canopy can suppress western redbud, while alder leaf litter may have inhibitory effects

Uses

Functions

TimberNitrogen FixationSoil Building

Common Questions

What zones does Red Alder grow in?

Red Alder grows in USDA hardiness zones 3 through 7.

Is Red Alder a nitrogen fixer?

Yes, Red Alder is a nitrogen fixer and can help provide nitrogen to neighboring plants in a guild or polyculture.

What are good companion plants for Red Alder?

Good companions for Red Alder include Honeycrisp Apple, McIntosh Apple, Asparagus, Beach Plum.

Design guilds with Red Alder and see companion relationships visually.

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