Black Locust
Robinia pseudoacacia · Hardwood
AI-generated identification · may be incorrect- Type
- Hardwood
- Origin
- Native to the Southeastern United States; widely naturalized throughout North America, Europe, and Asia.
- Hardness
- 1,700 lbf (Hard)
- Durability
- Very Durable. Exceptional resistance to rot and decay; known as one of the most durable timbers in North America, frequently surviving 50+ years in ground contact.
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Grain Pattern
Straight to slightly interlocked grain with a medium to coarse texture. Exhibits prominent cathedral patterns in flat-sawn sections and visible small knots/bird's-eye features common in live-edge slabs.
Color & Appearance
Heartwood is pale greenish-yellow to golden brown, while sapwood is a distinct thin band of pale yellowish-white. It darkens to a medium-brown with age and light exposure. Highly lustrous and exhibits strong fluorescence under UV light.
Hardness (Janka)
1,700 lbf (Hard)
Durability & Decay Resistance
Very Durable. Exceptional resistance to rot and decay; known as one of the most durable timbers in North America, frequently surviving 50+ years in ground contact.
Value & Age
$6.00 - $12.00 per board foot for live-edge slabs, depending on width and figure.
AI estimate for general guidance only — not a professional appraisal. Actual value depends on grade, dimensions, condition, and local market demand.
- Wood Age Estimate
- Freshly milled or recently harvested (under 1 year). The light greenish-yellow heartwood indicates little oxidation or long-term UV exposure, and the bark remains very tight and intact.
Common Uses
Fence posts, outdoor furniture, decking, timber framing, tool handles, boat building, and railway sleepers.
Geographic Origin
Native to the Southeastern United States; widely naturalized throughout North America, Europe, and Asia.
Workability
Difficult to work due to high density and hardness. Dulls cutting edges quickly. Glues and finishes well, though pre-boring is required for nails and screws to prevent splitting.
Finish Recommendations
Oil-based finishes (like Tung or Danish oil) highlight the natural golden hue. For outdoor use, high-quality UV-inhibiting spar urethane is recommended, though many leave it unfinished to weather to gray.
Notable Features
Glows bright yellowish-green under blacklight (fluorescence); high rot resistance makes it an eco-friendly alternative to pressure-treated lumber; contains specific toxins in the bark and leaves (though wood is generally safe).
