Add a splash of color to gardens and landscapes with sun perennials. These plants thrive in direct sunlight, including afternoon sun, and return year after year. Some of the most popular sun perennial plants are irises, peonies, coneflowers, daisies, lilies, daylilies and many ornamental grasses. Many other sun perennials are also available for sale. When selecting perennials for your sunny gardens and landscapes, choose a variety of plants with different bloom times. This will provide you with pops of color throughout the growing season. Other considerations when buying sun perennials are their hardiness zone, soil requirements, mature height and spread, bloom time, foliage and color, and other qualities such as fragrance, drought tolerance and deer resistance.