We have pocket gophers where I live. I'm not sure if this will work for groundhogs because they tend to come outside more. Are they eating the roots or the stems? But I bought this thing called a mole chaser. It's like a metal windmind looking thing. You put it on a metal hollow pole in the ground. It vibrates the ground and the underground critters don't like it. I have a big garden and one mole chaser right in the center works to keep those pocket gophers at bay. FYI- The sonic sound things don't work.
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