Thank you, Tisha & gardenfish, for your ideas & suggestions. I've never had large potted plants & with the size of the gardenias & their root system I'm not sure I could handle them. I had researched Gardenia care on this & other sites and was trying to find any "out of the box" ideas. Warming sticks? 
I'll play it by ear & hope we have a mild winter. I'll let you know how it goes.
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