Alnus rubra (Red Alder)

Short Overview Alnus rubra (Red Alder) is a fast-growing deciduous tree native to western North America, commonly found along rivers, floodplains, and moist lowlands. It is known for rapid establishment and its role as an early successional species.

Key Characteristics

Plant type: Deciduous tree (Alnus rubra)

Foliage color: Medium to dark green leaves turning yellow in fall

Flower color: Inconspicuous reddish male catkins and smaller female catkins

Bloom time: Late winter to early spring before leaf emergence

Foliage: Oval, serrated leaves with a slightly glossy surface

Growth habit: Upright, broad-crowned tree

Mature size: Typically 20–30 m (65–100 ft) tall and 10–20 m (30–65 ft) wide

General Growing Notes

Light: Performs best in full sun

Water: Prefers moist conditions; tolerates periodic flooding

Soil: Adaptable, including nutrient-poor soils

Care considerations: Minimal pruning required; develops rapidly under favorable conditions

Note: Growth rate and mature size may vary depending on site conditions and climate.