Can you get a big pot and put it on casters so it could be rolled into the garage? Mine is on the northwest corner of my lot, so it gets blasted by the North and Northwest winds. Most of our bad weather comes from those directions. I worried about how it would do this winter when we have had more cold than usual..and you see the results, I think it liked it!
Good luck..all the roses I have gotten from ARE have been beauties. I believe that is where I got my Mutabilis years ago.