The daylily has been cultivated for thousands of years and is one of the most adaptable landscape plants on the market. It's able to tolerate temperatures in zones 1-11. The 20 common species of daylily have been hybridized to form more than 45,000 recognized cultivars, with new cultivars entering the market every year. Despite such high numbers, daylilies are still in extremely high demand, with new or rare breeds winning awards and commanding large prices on the market.
It is easy to see why daylilies are in such demand. Each scape produces several flowers that bloom in succession. Once flowering in the garden, most daylilies will open their flowers at sunrise and whither by sunset, repeating the process the following day. Some of Dan River Plants' triploid daylilies will open their flower at sunrise and continue to stay open for days or even weeks at a time!