Josephine, I'm so happy to hear you're raising some Monarch cats! And I haven't tried giving that to Monarch cats yet. I haven't had any of those since Spring 2012...and had enough other milkweed, so didn't think of the vines. Glad to hear my vines might be used by the cats! Where did you get your milkweed vines? Ever seen any flowers? My Funastum cynanchoides vines grew from seeds I got in a trade. It IS invasive, I know that!
Fendler's Bladderpod, Lesquerella Fendleri
Greenthread, Thelesperma filifolium
Indian Blanket, Gaillardia pulchella