Asclepias is a butterfly favorite and a critical food source for monarch larvae. Also known as Milkweed or Butterfly Weed, these wildflowers attract a multitude of pollinators with their fragrant blooms. Asclepias can grow in a variety of conditions and most tolerate clay soils and periods of drought. These long-bloomers typically break dormancy late spring and bloom through the summer. Some types, such as A. tuberosa, will rebloom if deadheaded.