wintering potted hydrangea
How to help potted hydrangea survive Cape Cod, MA winter after its indoor culture all summer and the outdoors during this fall.
Certified GKH Gardening Expert
If it's already been accustomed to an indoor environment, then you could bring the plant inside for overwintering. Otherwise, you will have to provide adequate cold protection, such as wrapping the container/plant. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-winter-care-how-to-protect-hydrangeas-from-winter-cold-and-wind.htm