Oh, geraniums !
I have a 6 year old plant, been bringing it in each winter.
Why? No one here would ask that question.
This plant had 37 bloom clusters at one time, and repeats throughout the outdoor season. It's just an amazing, continuous performer - both in summer outside and winter inside.
West window sill in winter; east garden exposure in summer. Water weekly in winter. Only fertilize in summer. Stays in the same pot year-round. Ocasionally will repot in spring.