i have 16 delphiniums I have gown from seed but also have a hedgehop in my garden so can't put pellets to kill the slugs

Welcome to GoY
put the skins of fresh oranges [ones that have been juiced] or grapefruits near to the plants and in the morning you may well have caught them. Beer traps also work well . crushed egg shells/ coarse grit may also deter them but they do tend to find their way in. I have found that older delphiniums seem less attractive to the slugs/snails.

Sheep wool pellets work for me but they are very expensive. I think they need renewing after rainfall too.