You may need a grow light to provide the light they need, even though their growth slows down in the winter. When you take your plant outdoors for the spring, move it gradually so it can acclimate.
Some types of perennials, including hosta, do not have sturdy stems, and quickly turn to mush after a few hard freezes. Hosta, daylilies and iris are best cut back in fall to an inch or so above ...