Slug resistant plants

My morning glories and lupins are being munched at great speed by our ravenous slugs :(

Also asiatic lillies are being eaten as soon as they poke their buds above the soil but I'm using barrier methods to protect them.

However, hardy geraniums and astrantia have emerged completely unscathed so perhaps they can be added to the defiance list? I hope so, I need to know that something I have planted might make it through June!