Gleditsia caspica, also known as the Caspian Locust or Persian Honey Locust is a remarkable tree that is found in western Asia, specifically in the Caucasus region of Azerbaijan and northern Iran near the Caspian Sea. What makes this tree unique is its number and length of spines on its trunk, making it one of the most formidably armed of temperate trees. Gleditsia caspica has a symbiotic relationship with certain soil bacteria, which form nodules on its roots and fix atmospheric nitrogen, making it an excellent source of fertilizer for other nearby plants. This deciduous tree can grow up to 35 ft at a medium rate and is hardy to zone 6. It flowers from April to May and ripens its seeds in October. Gleditsia caspica is typically grown in loamy soil and in a sunny position, but can also tolerate drought and atmospheric pollution. Additionally, this tree is resistant to honey fungus and has a strong, durable, and coarse-grained wood. With its light canopy and late spring leafing, it makes an excellent top story tree in a woodland garden. Overall, the Gleditsia caspica is an impressive and versatile tree that belongs in any landscape.
