Have you ever tried to keep a garden and keep it free from snails (with and without shell)?
Well, good luck to you! That and weeds are the most annoying thing I have found so far in our garden!
But I have got a good suggestion for eliminating them without using pesticides or chemicals. Beer.
Yes, they drown, they are drunk and they get out of your plants!
It is enough to put a container in the ground. Fill it with beer and wait :-)