The All-American Daylily Selection Council (AADSC) is an organization that administers a network of test sites throughout North America, which perform rigorous evaluations of daylily cultivars, taking into account over 50 criteria. The Dilema for todays gardener is selecting from more than 40,000 different cultivars that have been registered.

Since 1985, the AADSC has tested or evaluated nearly 6,000 hemerocallis (daylilies) available in commerce. Using test protocols developed by Executive Secretary Angelo Cerchione, the AADSC has developed a baseline for excellence in daylily performance. Daylilies earning the AADSC’s All American designation show superior performance across at least five USDA hardiness zones. The AADSC differs from many other awards programs in that its results are based on scientific methodology.