Winter is here!

Weather forecast states, that from tomorrow we're setting to freezing night temperatures... even to -5 C. in the next days.

what plants?

It's a Brugmansia. My brother gifted a rooting to me from their giant tree in the backyard, which blooms with extraordinary pink/yellow/white bell~like flowers as they name them Angel Trumpets :)
My little tree also gave a little rooting seedling, which I separated in a smaller pot to go in a warmer room for better chance to survive to spring.
My tree lost some leaves as it is trying to go to sleep mode/ hibernate. The room where they all are is a bit cold and dark.
I put my cacti and succulents there every year with almost no watering.
Next spring they awaken and start growing again.
Otherwise you have to give them a very warm temperature and enough light if you don't want them to elongate!