Daylilies are so called because among the many flowers each plant can produce, each blossoms lasts only a day, as with this one just opening. Gardeners love the plants for many reasons, foremost among them their literally astonishing range of colors and color combinations: at last word, there were more 54,000 registered daylily hybrids. Daylilies are also remarkably easy to grow. For beginners and experienced gardeners alike, the best resource for learning the basics of these wonderful plants is the FAQ of the American Hemerocallis Society website. You'll find it here.