Arrowwood vs Mountain Alder - TreeTime.ca

Arrowwood vs Mountain Alder

Alnus incana subsp. tenuifolia

Viburnum dentatum

CUSTOM GROW

NOT AVAILABLE THIS SEASON - MIGHT RETURN

Mountain Alder
Arrowwood

Mountain Alder is a native cold-hardy shrub or small tree often found along streams and in moist forested habitats. Its nitrogen-fixing ability enriches soils and supports surrounding vegetation, while its extensive root system helps stabilize streambanks and slopes. The fast growth rate allows it to establish quickly on disturbed sites, making it especially valuable in reclamation, restoration, and erosion control projects.

Often forming dense thickets, Mountain Alder enhances habitat quality in riparian and upland areas. It provides food and cover for various wildlife, including birds and small mammals. Recognized as an important species for soil and water conservation, it is well suited for riparian planting, naturalization, and ecological restoration.

Note: We use Sitka Alder for Alnus incana subsp. tenuifolia. This species is also known by many other common names, including Grey Alder, River Alder, and others. Please confirm the scientific name to ensure you are ordering the correct plant.

Arrowwood is a cold hardy, reliable, and vigorous shrub that can easily grow on difficult sites. Featuring an upright, rounded, and multi-stemmed form, this shrub produces creamy white flowers against a backdrop of deep green, serrated foliage.

The flowers give way to dark, blue berries that will attract wildlife to your yard. Depending on the plant, Arrowwood's striking fall color can range from yellow, red to reddish-purple.

Many use Arrowwood for naturalization or mass planting projects but, more commonly, you'll see this simple yet elegant shrub as a shrub border or planted on its own.

Mountain Alder Quick Facts

Arrowwood Quick Facts

Zone: 1a
Zone: 2a
Height: 6 m (20 ft)
Height: 1.2 m (4 ft)
Spread: 3 m (10 ft)
Spread: 2.4 m (8 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: normal, wet
Moisture: normal, wet
Growth rate: medium
Growth rate: medium
Life span: medium
Life span: medium
Growth form: multi-stemmed, thicket-forming
Spreading: rhizomes - medium, seeds - low, layering - low
Suckering: high


Bark: smooth, gray to brown
Hybrid: no
Hybrid: no
Catkins: yes
Catkins: no


Native to: AB, BC, SK, YT, NT
Native to: ON, QC, NS, NB, PE
Other Names: river alder, speckled alder, thin-leaved alder, thinleaf alder, western river alder