My HOA has said I can no longer cover my gardenias during the winter. They thrived last winter when I covered them when the wind chill went below 28-30 degrees. Any ideas how I can keep them alive? Is there any kind is warming apparatus that would work? Can I did them up, plant them in container pots and bring them inside into an enclosed sunroom that has window film covering them meaning the shrubs would not get strong direct sunlight?