White Alder
Alnus rhombifolia
White alder is a fast riparian tree of western foothill streams, marking permanent water with its pale bark and glossy leaves. A nitrogen-fixing pioneer that shades and cools trout streams.
- Family
- Betulaceae
- Type
- tree
- Lifespan
- perennial
- Height
- 30–80 ft
- Spacing
- 20–40 ft apart
- Light
- sun
- Soil moisture
- wet, moist
- Soil pH
- neutral, acidic
- Bloom
- January, February
- Bloom colors
- yellow, brown, green
- Wildlife value
- songbirds, larval host, pollinators
- Caterpillar hosts
- ~255 butterfly & moth species
- Landscape uses
- specimen, rain garden
- Native states
- CA, ID, OR, WA