Believe it or not, one of the culprits digging into my pots is a toad who burrows underground during the day to stay cool in the summer. I usually try to give him his own pot, sometimes that works. Also the wrens sometimes like to dig for possible insects, they watch me pot things and sometimes come in afterwards to investigate. And of course squirrels. Erin Grace, Thomasville, GA, USA USDA zone 8b, AHS heat zone 9 thankful from the rain from Debby