Hemerocallis is a genus of hardy, long-lived perennials related to Lilies. Each plant produces several flower stalks with up to a dozen buds. The buds open in series, but a flower lasts only a day, giving the plant its common name, Daylily. By growing different varieties, you can enjoy blooms from mid-June until frost in a rainbow of colors (except blue). Daylilies grow vigorously, help suppress weeds, and are generally free from pests and disease. They thrive in full sun or light shade and tolerate many types of soil.