The term deciduous refers to daylilies that lose their foliage completely before or shortly after frost and over-winter with pointed foliage buds, usually just beneath the soil surface. Deciduous daylilies will resume growth in spring.  For registration purposes, deciduous daylilies are currently described as “Dormant” in winter.  Also see: Dormant, Foliage Habit, Resting/Dormant Bud

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The American Daylily Society