This is a geranium /pelargonium that my MIL gave me a while ago. She had overwintered a full basket size (3 plants) in her basement and gave it to me in full bloom next spring. When fall came I couldn't bear to let it go so brought it in to overwinter, and have done so for four years now.
So far, I have tried keeping it nearly dry in the unheated garage, taking cuttings, and keeping them coddled in heated indoor greenhouse shelving with full spectrum lights, and -this winter- putting them up against an uncovered SE window. Here it is looking very happy this morning