Perennials include all those flowering plants that bloom year after year (with care) such as chrysanthemums, marguerites, or daylilies. Some perennials grow, bloom, and then die back to ground level each year, while others are evergreen and produce new foliage even when they are not blooming. Whatever their growth habit, perennials require some grooming during the year to keep them healthy and good looking. Some may need...