I saw a bumper sticker that said that in Clintonville (surprise, surprise), but it got me curious, so I looked it up. Turns out butterflies, especially monarchs, love milkweed, so I told Matt to stop cutting ours down. We were rewarded this morning with this visitor:

Not a monarch, but an adult female Tiger Swallowtail Butterfly.
Luke's conversation with the butterfly:
Luke: What's your name?
Butterfly (whose voice sounds suspiciously like Luke's): Butterfly-ie.
Luke: Do you want to be adopt?
Butterfly-ie: What's adopt?
Luke: It means you lived alone in the forest, but now you can come and live with us and be in our family.
Butterfly-ie: Oh yes, I'd love to be adopt!
Luke: Ok, now you're in our family and can live in our yard.