I have a number of black locust saplings in the yard. A couple were a good two or three inches round in the yard. And one has been restarting in the garden (raised bed) for two years now. It was a good 5 year old tree a few years ago when I cut it down. I have dug down a couple feet, but the tap root never ended. And it seemingly never ends in sending up suckers in the area. I know there are chemicals and stuff at the hardware store. but this is also in the middle of the garden. I would just mow it off, but that is not possible. So what else can one do? Any tricks, home remedies, or a way to kill these off? Seems black locust is as hardy as they come. Very hard to get rid of. Thank you.