I've got aphids for them to eat! We do have a few ladybugs around, but not enough to control the aphids. The Swamp Milkweed Leaf Beetles are what I'm more worried about. I kill the adults, the larva and the eggs...yet, they still keep coming. 3 plants were completely eaten to the ground. Well, at the least the Monarch caterpillars I raised inside are all pupated...now I just wait for the butterflies to emerge!