Black Locust vs Cypress Oak - TreeTime.ca

Black Locust vs Cypress Oak

Quercus robur Fastigiata

Robinia pseudoacacia

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Cypress Oak
Black Locust

Cypress Oak is an upright, columnar tree that is well suited as a privacy screen or for lining paths and driveways. The upright branch angle causes it to have a narrower spread which makes it suitable for areas with limited space. It has been described as having an elegant, formal look, growing into an upright oval shape with a short trunk. Compared to other oaks it has a much faster growth rate, especially when young.

Cypress Oak is an ancient oak species of England. Traditionally druids respect the oldest oak trees, considering them to be oracles.

Note: Most Oak species can be considered toxic for many animals.

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.

Cypress Oak Quick Facts

Black Locust Quick Facts

Zone: 5a
Zone: 3a
Height: 17 m (55 ft)
Height: 12 m (40 ft)
Spread: 5 m (15 ft)
Spread: 8 m (25 ft)
Light: full sun
Light: full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: medium
Growth rate: fast
Life span: long
Life span: long
Suckering: none
Suckering: high


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


Other Names: columnar english oak, pyramid oak, upright english oak
Other Names: false acacia, yellow locust