Introducing the Gleditsia caspica, also known as the Caspian Locust or Persian Honey Locust. This remarkable tree 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. The 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. The 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 storey tree in a woodland garden. The closely related G. sinensis has a saponaceous pulp inside its seed pod, which can be similarly used for soap. Overall, the Gleditsia caspica is an impressive and versatile tree that belongs in any landscape.
