You will rarely ever see the caterpillar of the Red Admiral because they use silk to pull the leaves together to form a protective "nest" to hide in most of the time. False nettles certainly provide the more "gardener friendly" plant as it does not sting.
Thanks everyone! The spicebush swallowtails I had this year folded over the leaves of the camphor tree seedlings to hide during the day. Seeing all those folded leaves is what cued my curiosity to see what was inside. They actually seemed to prefer the camphor tree to the spice bush. Ive never seen a Red Admiral here but i did see my first question mark last year. If anyone has false nettle at the round-up maybe i can get some started and see if they will come.