Answer: How disappointing to end up with hundreds of little locust trees after all your work! I wish I had some encouraging news for you, but here's what's going on. When you cut the tree down, even though you applied stump killer, the roots were not affected by the chemical. The roots will continue to send out new shoots until they exhaust all of their stored energy. This may be a single season or it may continue for several years. It all depends upon how extensive the root system is. The only way to completely stop the process immediately is to have the stump ground down and the roots dig and removed from your yard. You are helping the cause by cutting down each of the sprouts as they emerge. It takes energy for the roots to develop the sprouts and if you keep them cut down as soon as they come up the roots will eventually deplete their stored energy and will die out. But, as long as the sprouts are allowed to remain they will, through a process called photosynthesis, send new energy back to the roots. Therefore, it's important to continue to cut the shoots down whenever they appear. I know it sounds like a never ending battle but you will succeed. It will just take some time.
Best wishes with your landscape!
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