I have planted tall milkweed and goldenrod because supposedly they attract butterflies. All they do is invade the yard, esp. the goldenrod.

Another problem 'butterfly attractor" is Queen Anne's Lace, which I never saw a butterfly on. It is toxic if handled when wet.

But I do see butterflies on vining milkweed. The DH and I are considering growing it on a trellis and removing seed pods before they open. It would be a pretty sight.

I have a lovely plant of the American native Joe Pye Weed which the bees love. The DH says he has seen butterflies on it, but I never have.