Green Ash vs Black Locust - TreeTime.ca

Green Ash vs Black Locust

Fraxinus pennsylvanica

Robinia pseudoacacia

Green Ash
Black Locust

Green ash is a fast growing tree with incredible golden yellow leaves in fall. This tree is native to the prairies and is well suited for drought and cold. Green ash can also tolerate soil compaction, periods of flooding and a wide variety of soils including alkaline. This makes green ash ideally suited for use in urban environments.

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.

Green Ash Quick Facts

Black Locust Quick Facts

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Zone: 2b
Zone: 3a
Height: 18 m (60 ft)
Height: 12 m (40 ft)
Spread: 12 m (40 ft)
Spread: 8 m (25 ft)
Moisture: dry, normal
Moisture: dry, normal
Light: full sun
Light: full sun
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no
Fall colour: bright yellow in early fall
Flowers: Creamy white flowers in a pyramidal shape bloom in may-june
Bark: dark reddish brown to balck with furrows
Growth rate: fast
Growth rate: fast
Life span: long
Life span: long
Suckering: low
Suckering: high

In row spacing: 1.8 - 2.4 m (6 - 8 ft)

Between row spacing: 5 m (16 ft)


Other Names: downy ash, red ash, swamp ash, water ash
Other Names: false acacia, yellow locust