I'm afraid I have no sympathy for snails and slugs. After over 30 years growing from seeds and cuttings, watching them grow, planting them out, only to find them dead and leafless in one night, I now go out late at night armed with a torch and a packet of salt. Probably very cruel, a nasty way to kill them, and I'll never go to Heaven, I suppose, but it's them or my plants and my plants will win every time. Strange though, no matter how many I kill in one night, there are still many more in the garden the next night!