Care of asiatic lilies
Can I keep my potted asiatic lilies in th container over the winter in my house?
It is not recommended to bring them into a warm house during the winter, as they need a cool dark period to regenerate. You can store the bulbs in the pot, in a cool garage, or cold frame after they start going dormant.
Here is an article with more information:https://www.gardeningknowhow.com/ornamental/bulbs/lily/planting-lilies-in-containers.htm