Sandbar Willow vs Mountain Alder - TreeTime.ca

Sandbar Willow vs Mountain Alder

Salix exigua

Alnus incana subsp. tenuifolia

CUSTOM GROW

CUSTOM GROW

Sandbar Willow
Mountain Alder

Sandbar Willow is a deciduous species native to much of North America. This mid-sized, fast-growing shrub can be found in very wet areas, making it an ideal plan to use in a wet area with erosion risk.

Sandbar Willow has long, narrow green leaves, and its grassy narrow stems give it an attractive, bamboo-like appearance.

All willow are important to native pollinators each spring as they have higher amounts of pollen and nectar early each growing season when other food sources are scarce.

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.

Sandbar Willow Quick Facts

Mountain Alder Quick Facts

Zone: 2a
Zone: 1a
Height: 4 m (13 ft)
Height: 6 m (20 ft)
Spread: 3 m (10 ft)
Spread: 3 m (10 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: any
Moisture: normal, wet
Growth rate: fast
Growth rate: medium
Life span: short
Life span: medium
Growth form: multi-stemmed, thicket-forming
Spreading: rhizomes - medium, seeds - low, layering - low
Suckering: medium


Bark: smooth, gray to brown
Seeds: located within the capsules on the catkins
Hybrid: no
Hybrid: no
Catkins: yes
Catkins: yes


Native to: AB, BC
Native to: AB, BC, SK, YT, NT
Other Names: river alder, speckled alder, thin-leaved alder, thinleaf alder, western river alder