Monarchs primarily rely on milkweed (Asclepias genus) to survive. This is because it is the only plant that the Monarch caterpillar can digest! In this article, you will learn what Monarch butterflies eat and why. What do Monarch Caterpillars Eat? Monarch caterpillars only eat plants from the Milkweed family (Asclepias spp). Some species include common milkweed,…