Black locust (Robinia pseudoacacia)

USDA Hardiness Zones

USDA hardiness zones
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Black locust (Robinia pseudoacacia)

Zone Zone  more information
Hardy to zone 4b
Mature Height Mature Height
Mature Spread Mature Spread
Growth Rate Growth Rate
Sun Sun
Full Sun
Moisture Moisture
Drought tolerant (also tolerant to moist soil, well-drained)
Fall Color Fall Color
Attracts Wildlife Attracts Wildlife
Flower Flower
Fruit Fruit
Evergreen Evergreen
Native to WI Native to WI
Additional Information Additional Information
usually a large, suckering tree; these cultivars are smaller; fast grower; blue-green leaves; showy, white, fragrant flowers in pendulous clusters in late spring; no fall color; can become invasive due to reseeding and sucker formation; full sun; adaptable to most soils and pH; tolerates poor soils; drought, heat, salt, and urban tolerant; susceptible to black locust borer; weak-wooded; native to east-central U.S.; hardy to zone 4b

UW Extension
For more information, see the UW Extension Urban Horticulture Team Web site:
Primary Author: Dr. Laura Jull
Photos by: Dr. Laura Jull and Dr. Ed Hasselkus

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