My Dipladenia Plant Froze. Will It Come Back?
Will it help to cut it back and bring inside?
Certified GKH Gardening Expert
It is likely that it will survive. It will likely, also, stay dormant until Spring. Once it comes time for it to come back out, give it a light pruning to take off any dead material, and it should spring right back to life.
This article will help: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/winterizing-mandevillas.htm