American Mountain Ash vs Black Locust - TreeTime.ca

American Mountain Ash vs Black Locust

Robinia pseudoacacia

Sorbus americana

COMING SOON

(new stock expected: fall of 2025)

COMING SOON

(new stock expected: fall of 2025)

Black Locust
American 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.

American Mountain ash is a beautiful, medium-sized ornamental tree that is ideal for residential lots. Mountain Ash blooms with tiny white flowers in the spring, followed by clusters of small red/orange berries in the summer.

American Mountain Ash's berries stay on the tree throughout the winter. This attracts birds and other small wildlife to your landscape as the berries are an important food source during the winter months.

Black Locust Quick Facts

American Mountain Ash Quick Facts

Zone: 3a
Zone: 2a
Height: 12 m (40 ft)
Height: 10 m (32 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


Fall colour: scarlet red
Bark: dark reddish brown to balck with furrows
Flowers: Creamy white flowers in a pyramidal shape bloom in may-june
Flowers: white clusters, spring
Berries: bunches of orange-red
Seeds: dark brown peapod-like pods
Seeds: seeds contained within the berries
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: ON, QC, NS, NB, NL, PE
Other Names: false acacia, yellow locust
Other Names: dogberry