There are three dormancy categories for daylilies: Dormant (D), Semi-Evergreen (SE), and Evergreen (E). "Dormant" means the foliage is deciduous and dies back to the ground in the winter. "Semi-Evergreen" means the foliage will stay green until the heaviest of freezes. "Evergreen" means the foliage will only recede partially, but not at all in southern states.
We grow all three types in Pennsylvania with great success, although the dormant varieties perform best in the coldest states, and the evergreen varieties perform best in the warmest states. It is important to note that a daylily is genetically intrinsic, meaning that if a particular cultivar is grown in Maine, it will have the exact same hardiness if that same cultivar is grown in Florida.
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