Well, also I'm guessing your County doesn't spray for skeeters too close to your house, either Mj? You have a butterfly 'preserve' going there.
I do get the Zebra longwings on 'Lady Margaret' from time to time but I think they have a lot of other things in my garden that they like. I see them constantly, and they roost here at night, too.
I wondered why this is the first year 'Lady Margaret' has actually done pretty well, and it's been in the same place 5 years. Come to think of it, haven't seen a lot of Frittillaries around here this year. Was thinking it was just the extra water, but probably not as much munching is going on.