Robinia pseudoacacia
Black locust is one of the most remarkable trees in North America. It grows fast on poor ground, pulls nitrogen from the air, and gives it back to the soil. Its heartwood is packed with natural compounds that fight off rot, fungi, and insects on their own, making it one of the most durable woods in the world. It's hard, too, about 1,700 lbf on the Janka scale, harder than oak and built to take decades of weather and foot traffic. It comes out of the log a warm golden green and weathers slowly to a soft silver. Everything that makes it great is already in the wood. Our job is simply to let it shine: no chemicals, no treatments, no shortcuts. Just the tree, as it is.
About the tree
Black locust in the Appalachian region
The mill
Appalachian Mountains
We're a fully integrated sawmill working one species. Our logs come from across the Appalachian region through local landowners and forestry networks. We harvest them through sustainable forestry practices, backed by reforestation programs. Everything is sawn, air dried, and milled with local craftsmen. We air dry all of our material. It takes time, and it keeps a dense, tension-prone wood straight and stable. From one board to a full boardwalk, no project is too big or too small.
How we mill it
Milling a black locust board by hand
The company
Over 25 years, one species
We saw what black locust could be before anyone else did. For generations it was a farm wood, used for fence posts and firewood. Our family spent over 25 years turning it into a complete architectural line. We taught architects, one project at a time, that North America already had a hardwood to rival anything imported from the tropics. Today that line covers decking, siding, boardwalks, site furnishings, and pavers. Other mills have followed since. We never needed to. One species is all we do, and no one knows it better.
About us
Logs arriving at the mill, Appalachian region
Certificate · Rev. 03 / 2026
Black locust is one of the most naturally rot resistant hardwoods on earth. We back every board that leaves our yard with the longest warranty in the lumber industry.
Read the full warranty
Issued by
Black Locust Lumber, LLC
Effective
Upon delivery
Coverage
United States, Canada, Mexico, Caribbean
Certified
No. BLL-WAR-2026-001
Introducing our ever-growing professional network
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