For many yeas been storing ours in attached garage in large containers on cement floor .

The arctic chill we had some yeas back felt bad and threw some old bedsheets over them here near Chicago .

Martin

I have a detached shed that I insulated with roll fiberglass insulation, walls and roof. I supplement with an oil fill heater plugged into a thermo cube plug. Turns on at 35 and off at 45 degrees. I have a thermometer which saves the hig and lows, so far my range has been between 28 and 47. Btw, after the last snow storm I shoveled some snow on top of my pots, letting it melt and gradually water the pots. Not a lot, just enough to moisten the pots.