Monarch Butterflies are fully and exclusively dependent upon milkweeds for laying eggs and for larva food source and they can nectar. These plants were once so plentiful they were literally called weeds because they were problematic in agricultural fields. However, that's no longer the case with regular Glyphosate treatments to agricultural fields wiping out all "weeds". With fragmentation, global climate change, pollution, and other threats this is a major problem for Monarch butterflies that heavily depend upon the milkweed and other native plants.Monarch's need milkweeds, but also nectar sources that many native flowers provide. Help keep these going! Please consider your part in this planet, plant Monarch food sources including milkweed and other native plants.
Asclepias viridis (Green antelopehorn Milkweed) is native to Southern half of Illinois. Extremely interesting flowers with cream on the outside and purple in the middle. This plant is short and compact, and it behaves well so it works well in smaller garden environments.
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Second Photo By By Marion Doss (http://www.flickr.com/photos/ooocha/4668059772/) [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons