These late-blooming plants native to North America help feed butterflies — especially monarchs-— at a crucial point.

Monarch butterflies are making their flight north after wintering in Mexico. Here's what to know about the fascinating, fragile traveler.

Monarchs rely on milkweed as the sole host plant for their caterpillars, and without it, their populations struggle to thrive ...

Scientists have long known that milkweed cardenolides, which in most animals disable a vital sodium-potassium pump enzyme if they are absorbed into the blood, serve to make caterpillars and ...

Monarch caterpillars eat 200 times their weight in milkweed and can devour a whole leaf in less than 5 minutes. Monarch butterflies are poisonous to predators because of the chemicals in the milkweed ...

It's hard to believe that milkweed has nearly disappeared from Vermont's landscape in just a few short years. In the Green Mountain State, corn crops are everywhere and along the edges of those fields ...

Just as monarchs famously prefer milkweed for food and egg-laying, swallowtail butterflies also have a preferred food as caterpillars. They prefer the leaves of members of the carrot family. But, if ...

Monarch caterpillars eat 200 times their weight in milkweed and can devour a whole leaf in less than 5 minutes. Monarch butterflies are poisonous to predators because of the chemicals in the milkweed ...