You might have luck with Tomcat mouse killer. It’s a bag of green chunks and a groundhog just might eat a bunch of it. We use it for too many chipmunks and it works great. No cats anymore and the neighbors cats are getting lazy and don’t come over as much. We gave our have-a-hart trap away years ago, caught one with it many many years ago - not easy. I actually had to enlarge their biggest trap on one end and a female still barely it in.
Thanks ill check that out. I don’t really care to take them alive though, but I would like 5o try everything possible to rid the garden of them. We are inundated with them in our neck of the woods. If I didn’t worry that they had some disease, I’d stew em up, but don’t quite trust that they are clean. I just don’t trust ground dwellers to be disease free much. (Mice, red squirrels, Prarie dogs, not that we have those here, but they are bad for diseases like bubonic plague and others, armadillos, etc, they al. Seem to carry some nasty stuff)