I don't object to snails existing, but I do object to the fact that they wreck my acanthus and my tradescantia. The acanthus is planted in the lawn so keeping that short does some good, but not enough. The tradescantia though is in a bed with pokers and picta grass closely planted so it's harder to keep them at bay there. Any suggestions? I do have chickens that I could let out but probably not often enough to make a lasting difference, and they aren't fussed about adult snails!