B*stard slugs'n'snails. Check the plants daily under the leaves and throw any away that have made themselves comfortable. I am evil and use slug pellets sparingly as have too many plants I don't want destroyed but neighbour swears by using straw around the base of the plant as they don't like it.
I wondered about organic pellets but had a hunch they might not be effective. Conversely if they're poisonous to a slug they'd be poisonous to other creatures? Like Tipsey I use the evil blue ones to protect plants
Asda seem to do some bargainous organic ones with mostly good reviews, I might give them a try:
There is a fantastic, ultra green, hedgehog friendly way to keep slugs away from plants Slug Gone - wool pellets I put a 6 inch layer around all plants they are utterly non toxic but slugs and snails hate to cross them and they rot doen into fertiliser and they are a waste product of UK hill farms what is not to like