Milkweed is the only source of food for caterpillars
of monarch butterflies. Monarch butterflies cannot reproduce without milkweed. As we've replaced natural habitat (that included milkweed) with suburban lawns and agricultural areas, we've destroyed milkweeed
plants. Gardeners can help reverse this trend and aid declining monarch butterfly populations by planting milkweed in their yards. Almost every year we find monarch caterpillars on our milkweed. We also find milkweed bugs, another species dependent on milkweed. Second, I've added nesting boxes. These often attract bird families. It's helpful to have several with each in a different location so that birds may choose the spot they like best. Some nesting boxes (birdhouses) are a cute garden ornament. If birdhouses are spaced far enough apart and food is plentiful, you may see more than one nesting pair.