Daylilies belong to the genus Hemerocallis and are not true lilies. This Greek word is made up of two parts: hemera meaning day and kallos meaning beauty. The name is appropriate, since each flower lasts only one day. Some of the newer varieties have flowers that open in the evening and remain open until the evening of the following day. Many of these night blooming plants are delightfully fragrant.
Originally from Europe to China, Korea, and Japan, their large showy flowers have made them popular worldwide, and there are over 60,000 registered named cultivars.
Daylilies can be grown in USDA plant hardiness zones 1 through 11, making them some of the most adaptable landscape plants. Most of the cultivars have been developed within the last 100 years.