overwintering a tropical clem in zone 5
I have a florida seiboldi clem which is not supposed to be hardy past zone 7. I have it in a pot and want to overwinter it. I'm not sure how cold it needs to get not ever having lived in the zones it is hardy in. Last year we overwintered it in the house and it bloomed in January, then again in July outside. I pruned it in early spring and then again just now. Does it need a colder winter than what it would get inside a house? My other option would be in my unheated garage but not sure how cold it will tolerate. Any warmer zone clem growers have any advice on cold temps it would be used to?