SteveM Clever, Steve! What ever it takes! We are doing 2 more raised beds for veggies this year...they will have rat wire on the bottom. So far that has worked for us. There is a large population of moles or gophers that push up mounds wherever it gets wet, but so far have not seen plant damage so ithink it is moles. I can't dig in this clay but those little guys just zip right through it!