Alnus alnobetula subsp. alnobetula

Common Names

Green Alder

Summary

Green Alder is a temperate-climate shrub in the Betulaceae family that grows in moist, well-drained soils along streams and in mountainous areas and exhibits winter dormancy. It is a nitrogen-fixing species that enriches soil, and its distinctive features include a shrubby habit with catkins and winged samaras.

For cultivation, it prefers loamy, well-draining soil with slightly acidic to neutral pH, consistent moisture, indirect bright light, and cooler climates. Propagation is by seeds (fall sow or stratify) or cuttings (late spring/early summer); seed dormancy is about three months. Fertilization with balanced 10-10-10 in spring-summer and pruning in late winter to early spring support vigor; it is not toxic. Uses include erosion control, soil improvement, and acting as a pioneer species in reforestation, while providing habitat and food for wildlife.

Lifecycle

Perennial

Height

32-33 ft

Spread

33-39 ft

Hardiness Zones

Zones 4-8

Sunlight Requirements

Ideally full sun. Tolerates partial shade.

Soil Type

Loamy, well-draining but moisture-retentive soil with pH around 6.5

Soil Drainage

Moist to wet soils

Soil pH

6.5-6.5 (slightly acidic to neutral)

Bloom Time

Spring

Foliage Color

Unknown

Fall Foliage Color

Unknown

Leaf Lifecycle

Deciduous

Growth Rate

Fast

Seasons of Interest

Spring, Summer, Fall, Winter

Propagation Methods

Seeds, Cuttings, Root suckers

Attracts Wildlife

Provides habitat and food for wildlife.