Buy the 2015 Old Farmer's Almanac!
From what I have long as yours is not a Tropical Hibiscus yours should survive the winter cold. Mine do fine up here in Pennsylvania. I don't cut mine back so I can't help you there.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?