Some would force the plumies to go to sleep, by cutting off the leaves half way and pull them out of the pot, clean off the soil, lay them in newspapers in a box, so you can store them safely and dry in a warm area. Maybe you can do that too.
Is your garage heated? If it is, then it should be okay to store them there..but if it is not, it maybe dicey. Our garage here is not heated, and it feels freezing cold too when temps are cold outside. You may want to store and make sure it is dry on newspapers in a box in any of your warmer rooms inside your house.
Your COT can still stay potted in a container indoors, just keep it warm and dry. It will slow down growth and rest, as it drops the leaves.
My hubby was also at loggerheads with me when I bring some of my plants indoors. I have to pull in most of my orchids, my Adeniums and the smaller Plumeria, and some other warm loving succulents. He finally understood and appreciated it when some of the orchids bloomed while indoors during winter..saved by the orchid bloom
