Western Mountain Ash vs Black Locust - TreeTime.ca

Western Mountain Ash vs Black Locust

Robinia pseudoacacia

Sorbus scopulina

NOT AVAILABLE THIS SEASON - MIGHT RETURN

Black Locust
Western Mountain Ash

Black Locust is an attractive tree. Its distinctive leaves are made of about a dozen bright green leaflets. It also notable for its fragrant white flowers, which smell of citrus.

Black Locust can grow in many situations, but prefers dry areas with lots of sun. It is robust and is an excellent choice for establishing shade in dry, open areas.

Important note: Much of the Black Locust is toxic to humans and livestock, including seeds, bark, and leaves.

Western Mountain Ash is a popular ornamental tree native to the western part of North America. Its attractive, white clusters of flowers bloom in early summer, making way for red, yellow or orange fruit in the fall. If the fruit doesn't catch your eye, Western Mountain Ash's autumn colours will capture your–and the birds's–attention.

Black Locust Quick Facts

Western Mountain Ash Quick Facts

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Zone: 3a
Zone: 2a
Height: 12 m (40 ft)
Height: 9 m (30 ft)
Spread: 8 m (25 ft)
Spread: 6 m (20 ft)
Light: full sun
Light: full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: fast
Growth rate: medium
Life span: long
Life span: medium
Suckering: high
Suckering: none


Bark: dark reddish brown to balck with furrows
Flowers: Creamy white flowers in a pyramidal shape bloom in may-june
Flowers: white
Berries: bunches of orange-red berries appear in late summer
Seeds: dark brown peapod-like pods
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: AB, BC, SK, MB, YT, NT
Other Names: false acacia, yellow locust
Other Names: cascade mountain ash, greene mountain ash