Here I always find most cats on first Tropical and second Swamp - even though I have a ton of plants of all kinds. When nectaring those fair both about the same. My butterfly weed (12 plants) have been blooming for ~ 3 weeks and I have seen ZERO nectaring and no eggs or cats.
I had one Sullivants MW but it bit the dust. I had I guess cutworms mow down my smorgasbord plot where I has 12 different species. All that is left is 2 poorly looking Swamp, one Tropical and 2 Common. 9 other species 1 each gonzo. Yeah - I AM ticked. That included many that were my only specimens! Included Purple, Poke, Green, Spider, Hello Yellow ...