I'm a bit confused by the question, are you thinking of dormancy in terms of simply loss of foliage as opposed to the scientific definition of a suspension of growth which may or may not be accompanied by loss of foliage? In my climate all daylily foliage is killed back to the ground in winter regardless of registered habit. Some daylilies registered as evergreen in warmer winter areas set dormant overwintering buds below the ground here and emerge as do the deciduous daylilies, with two short outer leaves like "bud scales".
