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Daylilies are clump forming perennials with arching, grasslike or straplike leaves 10-40 in (25-102 cm) long, depending on the cultivar. All the leaves arise from the base of the plant in two opposing ranks, resulting in a fanlike appearance which becomes obscured as the clump enlarges. A leafless stalk, called a scape, extends above the leaves and bears the flowers. Most scapes have two or more branches, each with several flower buds. In most varieties the flowers open one at a time, and last only one day, but the blooming period may extend for weeks, even months. The flowers have 6 tepals (3 petals and 3 very similar sepals), collectively called the perianth. There are more than 30,000 named cultivars of daylilies registered with the International Registration Authority. Daylilies are classified as evergreen, semi-evergreen or dormant. They also are classified by flower height, flower size, flower color, flower shape, time of blooming (day or night or extended), and season of blooming. Some cultivars are tetraploid (having twice the normal number of chromosomes), and some are diploid. Tetraploids tend to be more robust and less graceful. Almost all colors except true blue and pure white have been produced. Many cultivars have fragrant flowers.
Location
Culture
Daylilies usually are grown in mixed borders or planted in large drifts. They can be allowed to "be on their own" in the wild or woodland garden or along a pond or creek.
Features There are hundreds of societies dedicated to the cultivation of daylilies and the propagation of new cultivars. Visit the American Hemerocallis Society for a starter.
Steve Christman 10/31/00; updated 3/16/04, 5/7/05
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