Perennials are plants that can survive our winters year after year and typically require less maintenance than annual flowers. Below is a brief list of zone 4 perennials, categorized by bloom time:
Spring blooms: creeping phlox, trout lily, astilbes;
Early-summer blooms: black-eyed susan, bee balm, common milkweed, iris, spiderwort;
Mid-summer blooms: tall phlox, purple coneflower, sedum, joe-pye weed;
Late-summer blooms: sunflowers, blazing star, turtle head, chrysanthemum.
Before planting, research and check that your plants meet sun, soil, and hardiness requirements for yard. Whether your project is as large as an acre of wildflowers, or as small as a flower box, just remember: If you plant it, they will come.
On the web For more information on these topics, check out the following websites: - pollinator.org - http://www.extension.umn.edu/.