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While the "plant milkweed" is nice advice, I seem to remember that you have to plant a very specific species of milkweed. If you plant the wrong milkweed, you wind up killing the butterflies because they don't have enough energy for their migration.

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Not an expert, but some digging in on this indicates there is one species folks advice against (topical milkweed); otherwise the advice is a species native to your region.

Some sites out there can help you pick a milkweed for your region. [https://blog.nwf.org/2015/02/twelve-native-milkweeds-for-mon...] and [https://monarchjointventure.org/images/uploads/documents/Mil...]

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