It is in a 17 qt pot with holes drilled into the bottom and sides for ventilation. I have it in an unheated garage but it has not been really cold yet. I did the same thing about 3 years ago with some irises and had blooms nearly a month before the normal period. I move the pots outside during warm, sunny spring days and return them to the garage at night when it may freeze outside. It also works with roses but this is my first try with a peony.