Black Locust - NOT RECOMMENDED TO PLANT
Robinia pseudoacacia

Description

Robinia pseudoacacia, or black locust, is native to Southern Appalachia with a range that extends from central Pennsylvania to northern Georgia and westward to Arkansas and Oklahoma. This species is not recommended to plant due to its invasive tendencies. It is well-adapted to poor quality soil and is often used in land reclamation projects. While the northern tip of its range is only a few hundred kilometers south of much of Canada, it is considered to have invasive tendencies due to its rapid spread through root sprouts and abundant seeds causing it to crowd out native plant species. The tree can break branches in high winds and feature small thorns. Black locust is in the pea family and its roots fix Nitrogen in the soil.
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Planting Site and Native Range

Planting Site
Residential, Wide Median, Restricted Urban Site

Management Notes

Management Notes
Fruit litter may be an issue Thorns can be a safety concern for certain sites Root suckering occurs Known to naturalize or become invasive in certain regions

Tree Characteristics

Growth Rate
Fast (60cm or more per year)
Width
6 - 11m
Height
11 - 21m
Soil Quantity
11 - 20 m
Leaves
Deciduous

Insects and Diseases

Insects and Diseases
Most serious pest is Locust borer, however, cultivars have been developed that are resistant to this borer. Other issues include canker, powdery mildew, locust leaf miner but these are minor in comparison to the borer.

Tree Tolerances

Soil Salt Tolerance
Tolerant
Salt Spray Tolerance
Tolerant
Flooding Tolerance
Low
Drought Tolerance
Very High
pH Tolerance
Tolerant of acid to alkaline soil (5.0 to 8.0)
Shade Tolerance
Full Sun Part Shade Full Shade
Plant Hardiness Zone
Zone 4 (a/b) | Zone 5 (a/b) | Zone 6 (a/b)
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