I bring what I suspect are tender daylilies inside in the autumn. They grow under lights in the basement. If they go dormant (a few do but most do not) I break their dormancy with higher intensity light (about the same as a normal sunny spring day). I have been doing this for several years. The problems I have found with growing them inside is that they may have aphids (every year) or spider mites (this year for the first time). Also see my response in your other post.
