Black locust is among the hardest domestic woods, rated alongside hickory. It’s natural chemistries also make it an exceptionally rot and decay resistant wood. The color can range from pale greenish yellow to darker browns as it ages. The tree, which primarily grew through parts of the mid-Atlantic, was appreciated early on by pioneers for fence posts and to a lesser extent ship masts. Black locust has been increasingly valued as a natural and often more sustainable option for fence boards and posts, and in modern times, deck extensions.