Black Locust
Robinia pseudoacacia · Hardwood
AI-generated identification · may be incorrect- Type
- Hardwood
- Origin
- Native to the eastern United States, but widely naturalized throughout North America, Europe, and parts of Asia.
- Hardness
- 1,700 lbf (Very Hard)
- Durability
- Very Durable (exceptionally resistant to rot, decay, and insect attack)
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Grain Pattern
Straight to irregular grain with a coarse texture and distinct ring-porous structure visible on the end grain.
Color & Appearance
Heartwood is a greenish-yellow to dark golden-brown, which darkens considerably to a deep dark brown or amber with exposure to light and air. Sapwood is a very pale yellowish-white and is typically quite narrow.
Hardness (Janka)
1,700 lbf (Very Hard)
Durability & Decay Resistance
Very Durable (exceptionally resistant to rot, decay, and insect attack)
Value & Age
3.00 to 6.00 USD per board foot for rough-sawn lumber.
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 cut to recently felled log (weathering on the outer bark shows exposure of several months, but the core is green/fresh).
Common Uses
Fence posts, decking, outdoor furniture, shipbuilding, flooring, turned items, and railway ties.
Geographic Origin
Native to the eastern United States, but widely naturalized throughout North America, Europe, and parts of Asia.
Workability
Difficult to work with hand and machine tools due to extreme hardness and density; tends to blunt cutting edges quickly. Pre-drilling is essential for nailing and screwing. Glues and finishes well despite natural oils.
Finish Recommendations
Penetrating oils, marine varnishes, or exterior polyurethanes work well. Exterior applications are often left unfinished to weather to a silvery-gray patina.
Notable Features
Contains natural extractives (robinetin) that provide exceptional rot resistance without chemical treatment. Heavy, strong, and highly stable once seasoned.
