Some annuals will come back in the spring if you keep them in a freeze free environment during the winter months. I have geraniums that are 5 yrs. old now. I just set the pots in the garage at the threat of the 1st frost & then prune them up & put them out in the Spring. They get better each year. I think it is hard to get enough light inside to keep them blooming nicely during the shorter days of Winter.