White Alder | Alnus rhombifolia

A tall tree with green leaves against a partly cloudy sky.
Photo credit: Keir Morse
Trees with exposed roots near a water body, surrounded by greenery and partially submerged in the reflection of the water.
Photo Credit: Seven Oaks Native Nursery
The image shows a row of young green plants in pots, thriving under bright sunlight.
Close-up of glossy, green leaves on a branch with a blurred background.
Photo credit: Keir Morse
A tall tree with green leaves against a partly cloudy sky.
Trees with exposed roots near a water body, surrounded by greenery and partially submerged in the reflection of the water.
The image shows a row of young green plants in pots, thriving under bright sunlight.
Close-up of glossy, green leaves on a branch with a blurred background.

Description

Tolerant of seasonal inundation and drought. Nitrogen fixing and cold hardy. Less common than red alder (Alnus rubra) in Oregon.

Plant Details

Habitats Riparian Forests, Bottomland Forests
Habitat Notes Excellent shade and erosion control along streams
Phenology Flowering February-May
Mature Height 40-80’
Shade Preference Full sun, part shade
Soil Tolerance Moist soils
Special Uses Attracts birds; Provides wildlife forage, cover and food; Provides bank stabilization