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Red Alder

Alnus Rubra

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Overview

Red Alder (Alnus rubra) is a deciduous tree native to the Pacific Northwest. It thrives in moist environments, quickly reaching 50-80 feet high with a 20-30 feet canopy spread. Noted for its smooth gray bark and serrated leaves, it features catkins and small cones. Alder enriches soil by fixing nitrogen, making it beneficial for companion plants. Ideal for creating natural screens or riparian buffers in landscape designs.

Sun Full, Half, ShadeWater Extra in Summer, MediumZones 8–10Type TreeClimate Mediterranean, Temperate
Red Alder (Alnus Rubra) — woody cones that persist through winter

Culture

Sun
Full, Half, Shade
Water
Extra in Summer, Medium
USDA zones
8–10

Shape & size

Mature height
40–50 Ft.
Mature width
30–40 Ft.

Classification

Type
Tree
Family
Betulaceae
Climate
Mediterranean, Temperate

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Photos (62)

Red Alder (Alnus Rubra) — benefiting surrounding plantings.<br><br>When designing landscapes
Red Alder (Alnus Rubra) — The tree's leaves are notable for their ovate shape and serrated edges; the Red Alder (Alnus rubra) is a deciduous tree esteemed for
Red Alder (Alnus Rubra) — Their ideal hardiness zones range from 4 through 7
Red Alder (Alnus Rubra) — Noted for its smooth gray bark and serrated leaves, it features catkins and small cones; their ideal hardiness zones range from 4
Red Alder (Alnus Rubra) — Red Alder (Alnus rubra) is a deciduous tree native to the Pacific Northwest
Red Alder (Alnus Rubra) — tree with green and yellow blooms
Red Alder (Alnus Rubra) — this stately tree casts a gentle shade
Red Alder (Alnus Rubra) — Ideal for creating natural screens or riparian buffers in landscape designs; with a canopy width of roughly 20 to 30 feet
Red Alder (Alnus Rubra) — suitable for understory plantings.<br><br>Its bark showcases hues of gray and white
Red Alder (Alnus Rubra) — green and yellow flowers in the garden
Red Alder (Alnus Rubra) — with a canopy width of roughly 20 to 30 feet; ideal for creating natural screens or riparian buffers in landscape designs
Red Alder (Alnus Rubra) — suitable for understory plantings.<br><br>Its bark showcases hues of gray and white; gardeners should note their ability to fix
Red Alder (Alnus Rubra) — woody cones that persist through winter; tolerating a variety of soil conditions
Red Alder (Alnus Rubra) — Alder enriches soil by fixing nitrogen, making it beneficial for companion plants; red Alder (Alnus rubra) is a deciduous tree native
Red Alder (Alnus Rubra) — the bark develops a rugged
Red Alder (Alnus Rubra) — It thrives in moist environments, quickly reaching 50-80 feet high with a 20-30 feet canopy spread; the bark develops a rugged
Red Alder (Alnus Rubra) — Alder enriches soil by fixing nitrogen, making it beneficial for companion plants
Red Alder (Alnus Rubra) — which can significantly enrich nutrient-poor soils
Alnus Rubra
Alnus Rubra
Alnus Rubra
Alnus Rubra
Alnus Rubra
Alnus Rubra
Photographs by 5 contributors

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