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The root system (with root nodules) of a black locust ( Robinia pseudoacacia ) next to an American dime for scale.

Photo: Ninjatacoshell (CC BY-SA 3.0), via Wikimedia Commons

moderate water

Black Locust

Robinia pseudoacacia

Black Locust (Robinia pseudoacacia) is a landscape plant valued for its form and structure as much as its bloom. It reaches roughly 60 ft at maturity and blooms in spring. Match it to full sun to part shade and water on a normal schedule until it is established. One caveat: like any plant, its published range is a guideline, not a guarantee, for the specific microclimate of your yard. Given a spot that matches its light and water needs, it is a dependable, low-drama addition to the yard.

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Hardiness range

A hardiness zone is not on file for this plant yet, and a ZIP-level fit check is not available for it.

How it does in your yard

HabitNot recorded
Hardiness zoneNot recorded
Mature heightAbout 60 ft
Watermoderate
Bloom periodSpring
Native to the USNot recorded
Toxicitynone

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Questions

Is Black Locust native to the United States?

USDA PLANTS data does not record Black Locust as native to the United States.

What USDA hardiness zone does Black Locust need?

A minimum hardiness zone is not on file for Black Locust yet.