Has anyone successfully overwintered calibrachoa? I've tried it a few times with small to medium-sized plants, but have had no success. I kept them in a brightly lit, cool room, and watered them sparingly. They never seemed to have gone fully dormant, and they put out some sprigs of weak-looking growth from time to time. They seemed to hang in until late winter/early spring, but then pretty quickly died (woody sticks thing with no roots).
This year I got some end-of-season mixed planters dirt cheap that each contained some large specimens of the calibrachoa (many colors). I'd like to overwinter them if possible. Do you have any advice or suggestions, please?