Black Locust (most likely) or Osage Orange
Robinia pseudoacacia · Hardwood
- Type
- Hardwood
- Origin
- Native to Eastern North America (Appalachian region) but widely naturalized across the United States, Europe, and Asia.
- Hardness
- 1700 lbf (Hard to Very Hard)
- Durability
- Very Durable. Exceptional resistance to rot and decay; it is one of the most durable woods in North America, often used for fence posts because of its ground-contact longevity.
Got a wood sample like this?
Identify any wood from a photo, free.
Grain Pattern
Straight to slightly irregular, with prominent cathedral figure on flatsawn surfaces and distinct ring-porous growth rings evident in the end grain.
Color & Appearance
Heartwood is typically yellowish-green to golden brown; sapwood is yellowish-white. It exhibits a high natural luster and tends to darken to a deeper russet brown or golden color with age and UV exposure.
Hardness (Janka)
1700 lbf (Hard to Very Hard)
Durability & Decay Resistance
Very Durable. Exceptional resistance to rot and decay; it is one of the most durable woods in North America, often used for fence posts because of its ground-contact longevity.
Value & Sustainability
- Estimated Market Value
- $5.00 - $8.00 per board foot depending on grade and regional availability.
- Wood Age Estimate
- Fresh cut or recently milled, indicated by the bright, unoxidized surface and rough fuzzy fiber-tear on the edges from a coarse blade.
- Sustainability Status
- Highly sustainable. Not listed by CITES or the IUCN; considered invasive in some regions due to fast growth and vigor.
Common Uses
Fence posts, decking, outdoor furniture, heavy construction, mine timbers, boat building, and turning.
Geographic Origin
Native to Eastern North America (Appalachian region) but widely naturalized across the United States, Europe, and Asia.
Workability
Challenging due to its high density and hardness. It can cause significant dulling of tool edges. Glues and finishes well, though pre-boring is mandatory for screws.
Finish Recommendations
Penetrating oils or outdoor-rated polyurethanes. Its high density can make film finishes prone to peeling if not properly maintained outdoors.
Notable Features
Often fluoresces under a UV (black) light; high tannin content; very heavy and dense; excellent fuelwood due to high BTU output.
