You're quite welcome, Terese. Sounds like you've got a pretty good start, already. I've never grown Yarrow so I can't really say anything about it. I don't think it's a host plant for anything but I don't know about nectar. I always think of it more as an herb and I'm not much of an herb person.
I don't have bunnies in my yard, although I saw two raccoons running along the opposite side of the street this morning. That was pretty funny. My neighbor's used to have a pet rabbit and their son would come over to my yard with his little wagon and collect the weeds in our yard. I think a lot of that was because his mom knew we didn't use much pesticide because I was a butterfly gardener. Definitely safe for the rabbit to eat. And he never picked anything that was a host plant so I was like, "Please, take my weeds!"
I just bought a bunch of plants today so I'm going to have to get out there and do some planting! I've got Dad to help out, too. I want all my host plants in place before the butterflies arrive.