Black Locust vs Osage Orange
Black Locust (Robinia pseudoacacia) and Osage Orange (Maclura pomifera) are two woods people often weigh against each other. Osage Orange is the harder of the two at 2040 lbf on the Janka scale, versus 1700 lbf for Black Locust, which affects how each handles wear, tools, and denting.
| Property | Black Locust Robinia pseudoacacia | Osage Orange Maclura pomifera |
|---|---|---|
| Type | Hardwood | Hardwood |
| Cost | $$ · Moderate | $$$ · Premium |
| Hardness | 1700 lbf | 2040 lbf |
| Workability | Fair | Difficult |
| Seasonal movement | Small | Small |
| Outdoor-friendly | Yes | Yes |
| Origin | Domestic (North America) | Domestic (North America) |
| Commonly built | Fence posts, Outdoor benches, Decking, Trellises | Bows, Turned bowls, Fence posts, Game calls |
| Overview | One of the most rot-resistant woods on earth and brutally hard, a domestic answer to tropical decking. Tough to work but lasts for decades outdoors. | Brilliant golden-yellow, extremely hard, and famously rot-resistant, the traditional bow wood. Vivid but demanding, and it darkens to amber over time. |
Finishing
Black Locust
Very hard and dense, so finish penetrates slowly; its natural rot resistance means it is often left unfinished outdoors, weathering to gray. Takes an exterior penetrating oil or stain well when finished. The greenish-yellow color ages to a warm brown under UV. Open grain can be filled for a smooth indoor film finish. Use non-corroding fasteners; like other durable woods it can react with iron.
Osage Orange
Starts a brilliant golden-yellow that inevitably darkens to a rich amber-brown under UV exposure, no finish fully prevents this, though a UV-inhibiting finish slows it. Very hard and dense, so finish sits more on the surface than penetrating. Takes a high polish. The color-shift is a known trait to plan around, not a defect.
Want to weigh these against a third wood, or compare different species? Use the interactive comparison tool.