My area is more farming and fewer woodlands, so deer seem to go for almost anything in my garden. They only seem to eat the foliage early in spring when it is first coming up, and again after frost if the plants are evergreen. Between those times, they will go down the rows and eat the buds from every scape they come to. Of course, they do prefer the new twigs on my fruit trees more. In an area where there are more woodlands, perhaps having more of a selection other than daylilies might be the factor that will save your daylilies- but I wouldn't count on it.