[inferiorhuman]

I'd suggest doing some research before planting stuff. I recently read that it's suggested to not plant milkweed (and to be ensure you cut it back seasonally if milkweed is appropriate) if you live in certain areas as it may otherwise disrupt their migration.

If you're looking to attract butterflies there are other endangered butterflies that can use your help. E.g. the Misison blue butterfly likes certain species of lupine. Black swallowtails, while not endangered, love dill. Don't underestimate how much even just a couple caterpillars will eat.

Other fauna seem a lot less picky. The hummingbirds out here seem to like the natives and "exotics" equally. The leafcutter and carpenter bees too. If you're in California, Calscape (dot org) is a great resource. And if you're in the Bay Area there are plenty of nurseries that specialize in native landscaping that can offer guidance. In the LA area, check out the Theodore Payne Foundation.