American Elm vs Black Walnut - TreeTime.ca

American Elm vs Black Walnut

Ulmus americana

Juglans nigra

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American Elm
Black Walnut

American Elm is fast growing, tall tree with a recognizable and pleasing shape.

It's well suited for urban environments because of its non-invasive roots and ability to grow on harsh sites (quite salt tolerant). American Elm develops a wide, dense canopy that provides shade for many city streets around North America.

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.

American Elm Quick Facts

Black Walnut Quick Facts

Zone: 2a
Zone: 3a
Height: 30 m (98 ft)
Height: 14 m (45 ft)
Spread: 15 m (50 ft)
Spread: 9 m (30 ft)
Moisture: any
Moisture: dry, normal
Light: partial shade, full sun
Light: partial shade, full sun
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no
Fall colour: bright yellow
Nuts: corrugated nut with edible meat
Growth rate: fast
Growth rate: slow
Life span: very long
Life span: long
Suckering: medium
Suckering: low




Other Names: water elm, whilte elm
Other Names: american walnut