Black Locust
Robinia pseudoacacia · Hardwood
- Type
- Hardwood
- Origin
- Native to the Appalachian Mountains and the Ozark Plateau of the United States; widely naturalized across North America, Europe, and Asia.
- Hardness
- 1,700 lbf (Hard to Very Hard classification)
- Durability
- Very Durable. Exceptional resistance to rot and decay; it is widely considered one of the most durable woods in North America, outperforming most species in ground contact.
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Grain Pattern
Usually straight but sometimes slightly interlocked. The end grain shows prominent, closely spaced earlywood pores filled with tyloses, creating distinct growth rings and a coarse texture.
Color & Appearance
Heartwood is a pale yellowish brown to greenish or golden brown, as seen in the freshly cut sample. It darkens to a russet brown with age. Sapwood is yellowish-white and clearly demarcated from heartwood.
Hardness (Janka)
1,700 lbf (Hard to Very Hard classification)
Durability & Decay Resistance
Very Durable. Exceptional resistance to rot and decay; it is widely considered one of the most durable woods in North America, outperforming most species in ground contact.
Value & Sustainability
- Estimated Market Value
- $5.00 - $8.00 per board foot depending on region and drying condition.
- Wood Age Estimate
- The sample appears relatively fresh or recently cut based on the brightness of the yellow-green hues, likely processed within the last 12 months. Growth rings suggest a tree that was at least 20-30 years old.
- Sustainability Status
- Not listed in the CITES Appendices or on the IUCN Red List; generally considered sustainable and even invasive in some regions due to fast growth.
Common Uses
Fence posts, boatbuilding, exterior furniture, heavy decking, mine timbers, railroad ties, and tool handles.
Geographic Origin
Native to the Appalachian Mountains and the Ozark Plateau of the United States; widely naturalized across North America, Europe, and Asia.
Workability
Difficult to work due to its high density and hardness. It has a high blunting effect on tool edges. Turns well but may produce tearout if grain is interlocked. Glues and finishes well.
Finish Recommendations
Penetrating oils or marine-grade spar varnishes for outdoor use to preserve color; polyurethane or lacquer for indoor furniture. It takes a polish very well.
Notable Features
Often fluoresces under UV light (appearing bright yellow/green). Contains high amounts of tyloses which block the pores, making it extremely water-resistant. Known for its high strength-to-weight ratio.
