Black Locust vs American Sycamore - TreeTime.ca

Black Locust vs American Sycamore

Platanus occidentalis

Robinia pseudoacacia

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American Sycamore
Black Locust

American Sycamore is the largest tree native to eastern North America. Generally too large and messy to be a street tree, American Sycamore thrives in large, open spaces, such as an acreage or farm.

The bark is one of the main features that draw people to this tree. The outer bark flakes off in irregular pieces to reveal an attractive white, green, and cream colored inner layer, providing winter interest.

American Sycamore has an extremely fast growth rate, gaining up to 6 ft in one year, and will easily reach its mature height in a short period of time. Be wary of this trees' root system, as it's typically very extensive and needs lots of room to expand.

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 Sycamore Quick Facts

Black Locust Quick Facts

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Zone: 4a
Zone: 3a
Height: 23 m (75 ft)
Height: 12 m (40 ft)
Spread: 8 m (25 ft)
Light: partial shade, full sun
Light: full sun
Moisture: normal, wet
Moisture: dry, normal
Growth rate: fast
Growth rate: fast
Life span: long
Life span: long
Suckering: none
Suckering: high


Bark: dark reddish brown to balck with furrows
Flowers: Creamy white flowers in a pyramidal shape bloom in may-june
Seeds: dark brown peapod-like pods
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: ON
Other Names: false acacia, yellow locust