Black Walnut is a large, stately tree of eastern bottomlands and rich upland slopes, producing the most valuable hardwood lumber of any native North American species. The hulls of its nuts contain juglone, a chemical that inhibits growth of many neighboring plants. Squirrels are the primary dispersers of its large nuts, often burying far more than they retrieve.
Best time to see a Black Walnut
The best time to see a Black Walnut is July–October, when about 60% of U.S. sightings happen, based on 30,630 research-grade iNaturalist observations.
Not certain it is a Black Walnut? What plant is this? walks through what to check first and the lookalikes that catch people out.
Recent Black Walnut sightings near you
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