Not sure if it's 'organic' but BEER ! Put a small flatish bowl of beer in the garden. They are attracted to it..and will go to it and ..sadly drown in the booze.
Diotamachious (?) earth or oyster shell powder. Chichens and guinneas are great. I hardly ever see snails or slugs in my veggie gardens. Just around the rocks in the flower borders.
Kris
Turn your face to the sun and the shadows fall behind you. Maori proverb
Chickens!! And if not chickens, the diatomaceous earth is the next best thing. Food grade is best so that you don't introduce unwanted chemicals. Of course, beer works, but I never buy it. :)
Well if they are big enough, I saw an episode where Chef Gordon Ramsey paid his kids to collect all his garden snails, then he kept them in a jar and fed them and organic diet for 10 days then he boiled them and ate them!
Come to think of it..Beer is pretty 'natural' as it's ingredients are 'barley, water and yeast'...personally..I don't care for it, but the snails love it.
I have heard (not tried yet) if you can copper pennies around the plants base. When the snail touch them it kills them. Something about the copper and moisture gives them a good jolt. Probly need older pennies so they'll have enough copper in them. Let me know if this works.
"If you need help ask God, if you don't Thank God."