Black Locust
Robinia pseudoacacia · Hardwood
- Type
- Hardwood
- Origin
- Eastern and central North America, widely naturalized elsewhere.
- Hardness
- 1700 lbf (Very Hard)
- Durability
- Very Durable
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Grain Pattern
Straight to slightly irregular grain with prominent ring-porous growth rings and a distinct cathedral pattern on flat-sawn sections.
Color & Appearance
Heartwood is a golden brown to greenish-yellow, darkening significantly to a deep dark brown or amber with exposure to UV light and air. Sapwood is a contrasting creamy pale yellowish-white and is relatively narrow.
Hardness (Janka)
1700 lbf (Very Hard)
Durability & Decay Resistance
Very Durable
Value & Sustainability
- Estimated Market Value
- 3.50 to 6.00 USD per board foot depending on dimensions and quality.
- Wood Age Estimate
- Recently cut freshly harvested log section, approximately 15 to 20 growth rings visible.
- Sustainability Status
- Least concern, abundant and sustainable native North American hardwood.
Common Uses
Outdoor furniture, decking, fence posts, shipbuilding, flooring, turned items, and exterior construction.
Geographic Origin
Eastern and central North America, widely naturalized elsewhere.
Workability
Challenging to work due to extreme hardness and density. High blunting effect on cutting edges, but turns and glues well.
Finish Recommendations
Takes oils, varnishes, and water-based finishes well, though pre-boring is recommended for nailing or screwing.
Notable Features
Contains natural extractives that provide exceptional rot resistance without chemical treatment. Highly shock-resistant and stable.
