Tropical lily? Everything I have read is do not take out until water temperature is stable at 70 degrees. I did have a few that I kept in the basement over winter, stuck them outside, thought we were getting warm............nope lol. Anyways one is growing very small leaves one is not. They go dormant at lower temperatures and usually die. My pond is just hitting 70 and trying to stay there.
You should have it covered with water, at least 18 inches, keep it warm and it may start growing for you.
here is a way to keep over winter: and how to bring outside again:
Another, and some may find easier, method for over wintering day-blooming tropical waterlilies is to simply remove the potted lily from your pond around the first frost (preferably just before). Remove all of the leaves and stems, including any remaining buds, and place the container in a 55-65 degree F dark area in your home. Once the container is in place, ignore it for the next 4-5 months as it gradually loses its moisture to the room around it. This slow drying closely mimics the natural process by which most tropical lilies are forced into dormancy. Unlike hardy lilies (and other hardy plants for that matter), topical lilies don't normally experience a winter in the climatic zones where they originate, but instead enter a dry season. The lack of rainfall triggers a hormonal reaction in the tuber of the lily, causing it to form a husk-like covering on the outside of the tuber(s). This covering is what holds in the moisture and protects the lily from drying out entirely. In theory, a lily can be held in its dormant state for several months, though is recommended that they not be subjected to too long a period of dryness. Though this last method isn't a guarantee that you'll be able to keep your tropical alive from seson to season, it is certainly worth the attempt given the attraction of the tropical lily flowers (not to mention the annual cost associated with replacing a lily year after year). To start growth again in the spring, simply wait until the pond temperature is at least 70 degrees F, which usually isn't until mid-May/early June. At this time, place the container in the pond at the recommended depth for the lily (usually 18-24"). Within approximately 2-6 weeks, growth should be apparent, though not necessarily vigorous at first.