Every year, the iconic Monarch butterflies migrate 3,000 miles from Canada to Mexico and back, passing through and laying eggs in Eastern Iowa. Monarchs only lay their eggs on milkweed, but herbicides have taken their toll on the plant and has sent the Monarch population into a drastic decline. See how the Monarchs in Eastern Iowa Okbook group has saved more than 4,000 Monarch butterflies by teaching hundreds of people to grow milkweed.