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If you're a fan of monarch butterflies—those orange and black migrating superstars of the insect world—then you know about milkweed.

Milkweed is, of course, the only plant that monarch caterpillars eat. They absorb a lot of the plant's toxins, which makes them unpalatable to a wide variety of predators. So growing milkweed is a definite way to support the monarch population at a time when butterfly populations in general are declining and migratory monarchs in particular are threatened due to climate change, habit loss, and pesticide overuse.

But milkweed actually supports far more than just monarch caterpillars! As the U.S. Fish & Wildlife Service explains, na

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