I've been adding most of these plants to my garden in hopes of seeing more butterflies.
I recall for many, many years, we did not see any ... the past few years we have seen a few here and there.
I see much more at our place in Wisconsin ... I plan to bring seeds with me for scarlet MW and a few other nectar plants.
Keep in mind that this is only the list of seeds that Monarchwatch.org sells in their kit. Every garden has its own stars in the garden as far as nectaring butterflies are concerned… mine are zinnias and phlox.