If the butterflies are attracted to the smell what do people think of hanging mothballs near the planted veg.
My OH is going to build me an enclosure at the weekend ready for me planting out some (boo hoo shop bought stuff as mine got slugged!!) and I just wondered whether the smell of the mothballs would put off the butterflies as it does the cats and squirrels. Going to hang them in those little mesh bags that the fatballs come in.

Think I'll give it a go anyway and see what happens and if it works I'll let you know.