How can I winterize lilies to ensure they survive the cold weather?

To winterize lilies, you can protect them by adding a layer of mulch around the base of the plants to insulate the roots from the cold. You can also cut back the foliage after it has died back naturally and cover the area with a layer of straw or leaves for added protection. Additionally, consider planting lilies in a sheltered location to shield them from harsh winter winds.