Perennial plant collections are an economical and fun way to grow a variety of plants. Because perennials come back year after year, gardeners spend less time planting when growing perennials, rather than annual plants. Our perennial plant collections feature popular perennial plants, including ornamental grasses. When choosing perennial plant collections to buy online, make sure the perennial plants will grow in your hardiness zone or grow zone. Next, consider their light requirements (full sun, partial shade or full shade), soil requirements, mature heights and spread, bloom time (if applicable), number of plants in the collection, and the flower colors in the perennial plant collection (if applicable).