Just like bees need plants that provide pollen, butterflies rely on plants for a place to lay their eggs and to provide a food source for emerging caterpillars. Check out this list of plants for caterpillars and butterflies from Michigan State University Extension.
If you are a grower looking for information on producing plants that are safe for pollinators, or which plant types can be marketed as good food sources for bees, the new publication “Protecting and Enhancing Pollinators in Urban Landscapes” provides a good resource.
Public interest in protecting bees and other pollinators has initiated a new market for flowers that are good food plants for pollinators. Here’s a list of annuals Michigan State University Extension recommends that are attractive to bees and other pollinators.