Carp I had a similar problem with cats and skunks. Either they were digging or just taking a nibble and then moving on to the next plant. I used a smaller version of a cattle fence. I borrowed from a friend but you can buy one at your local hardware store. You hook it up to 120 volt supply and it induces a voltage that does not kill the animals just scares them away. They have not returned as of yet. I think there is a unit that is hooked up to a 12v battery also. Hope this helps Mickey