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Green Alder vs Black Locust

Alnus crispa

Robinia pseudoacacia

Green Alder
Black Locust

Green Alder is a cold hardy, native shrub. It is often planted on infertile sites so it can fix nitrogen from the air and improve the soil quality.

Green Alder is known for its smooth grey bark and attractive shiny green leaves; it is commonly used in reclamation.

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 ALDER QUICK FACTS

BLACK LOCUST QUICK FACTS

Lowest Price: $6.99
Lowest Price: $6.99
Zone: 1a
Zone: 3a
Height: 7 m (23 ft)
Height: 12 m (40 ft)
Spread: 3 m (10 ft)
Spread: 8 m (25 ft)
Moisture: any
Moisture: dry, normal
Light: any
Light: full sun
Fuzz/fluff: yes
Catkins: yes
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: short
Life span: long
Suckering: high
Suckering: high

In row spacing: 0.9 m (3 ft)

Between row spacing: 5 m (16 ft)



Other Names: mountain alder, sitka alder
Other Names: false acacia, yellow locust