Slugs don't go for my lavender but not sure about wallflowers. My perennial ones do not suffer from slug damage but perhaps you mean the annual ones.

not that I am aware of. at least they don't in my garden : so far :p

No, not here at any rate. Why do you ask?

'Cos they ate my new lobelias and I have just bought the afore mentioned and I didn't want it to happen again!
Thanks for your replies I can relax now. :)