Black Hawthorn vs Mountain Alder - TreeTime.ca

Black Hawthorn vs Mountain Alder

Crataegus douglasii

Alnus incana subsp. tenuifolia

NOT AVAILABLE THIS SEASON - MIGHT RETURN

CUSTOM GROW

Black Hawthorn
Mountain Alder

Black Hawthorn is a versatile plant that is native to wetlands and other areas with moist soils, but can also tolerate dry soils. This plant can be grown as a short shrub, or a tree reaching 30 feet tall.

Black Hawthorn is valued for erosion control and attracting pollinators. It also makes an attractive flowering ornamental that can be planted as a specimen or pruned as a hedge. It is commonly used in shelterbelts.

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.

Black Hawthorn Quick Facts

Mountain Alder Quick Facts

Zone: 3a
Zone: 1a
Height: 8 m (25 ft)
Height: 6 m (20 ft)
Spread: 5 m (15 ft)
Spread: 3 m (10 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: any
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: medium


Foliage: contains thorns
Fall colour: yellow to red
Bark: brown to gray
Bark: smooth, gray to brown
Flowers: white
Berries: purplish-black pomes
Hybrid: no
Hybrid: no
Catkins: no
Catkins: yes


Native to: AB, BC, SK, ON
Native to: AB, BC, SK, YT, NT
Other Names: crataegus columbiana, douglas hawthorn, douglas' thornapple
Other Names: river alder, speckled alder, thin-leaved alder, thinleaf alder, western river alder