Last year I had a basil plant in a pot and it flourished. This year, I put it in the ground - same location where the pot was last year. Every morning I go out and more of the overall plant (leaves only) have been gobbled up. I don't see any bugs on or around it. I refuse to use Sevin and don't really want to use any chemical sprays. Any ideas on what's likely eating it and/or a solution to the problem?