Locust volunteers often come up from the roots of the primary tree. Root prune around the
volunteer tree to disconnect it from the main tree. Wait 6 months or a year. If the volunteer survives it will have developed its own additional roots and will transplant much more successfully. Naturally, transplanting when it is dormant in early Spring will help. I like locust because they grow fast and provide quick shade and visual cover from a view you may not like. They also are part of an edible landscape as you can also eat the pods. I dislike them because they tend to be messy from falling branches and you have to be careful about keeping the volunteers cut down, or you'll quickly have a grove of trees instead of single trees. Black locust also make excellent, long lasting
fence posts. They can make a decent cash crop. I like
honey locust because, to me, they are a more graceful looking tree. And they have no thorns. Another tree I like because of fast growth, shade and cover is cottonwood. Plus, while its not particularly a good
firewood, the trees grow fast and provide lots of
wood.