Western Mountain Ash vs Black Walnut - TreeTime.ca

Western Mountain Ash vs Black Walnut

Juglans nigra

Sorbus scopulina

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Black Walnut
Western Mountain Ash

The Black Walnut is a slow growing, large, straight-stemmed tree with an open crown. It produces dense, very hard, edible nuts.

Black Walnut has a deeply-furrowed, black bark. Its leaves are about 1 foot long, composed of 15 - 23 slightly stalked leaflets on a moderately stout stock which provide good dappled shade.

Despite being highly valued for its edible nuts and its shade tree aesthetics, it is rare to see this tree on the prairies.

Note: Black Walnut's roots produce a substance named juglone that is toxic to some other plants. Consider this when choosing where you plant a black walnut, as you will not be able to grow tomato, potato, cabbage, eggplant, blueberry, azalea, rhododendron, lilac, red pine and apple in the surrounding area.

Note: Plant this tree once. It will not respond well to transplanting.

Note: Although self-pollinating, planting two trees significantly improves nut production.

A top CO2 absorbing species. Experts think this tree may help climate change more than others.

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 Walnut Quick Facts

Western Mountain Ash Quick Facts

Zone: 3a
Zone: 2a
Height: 14 m (45 ft)
Height: 9 m (30 ft)
Spread: 9 m (30 ft)
Spread: 6 m (20 ft)
Moisture: dry, normal
Moisture: dry, normal
Light: partial shade, full sun
Light: full sun
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no
Berries: bunches of orange-red berries appear in late summer
Flowers: white
Nuts: corrugated nut with edible meat
Growth rate: slow
Growth rate: medium
Life span: long
Life span: medium
Suckering: low
Suckering: none




Other Names: american walnut
Other Names: cascade mountain ash, greene mountain ash