I've grown it under what amount to field conditions here in Maryland: full blazing sun all day. It grows like a weed (a nice weed). So far I have not tried it outside for the winter. Some plants stored in plastic bags for the winter and not yet planted have sprouted in the bags (they are out on the deck) and produced healthy growth - there is no soil in the bags, but they do get water. These appear to be very tough plants. Last year when I dug them I was surprised to see the nice clutch of "potatoes" - are these edible? Jim McKenney Montgomery County, Maryland, USA, USDA zone 7, where we've been in the steam bath for a couple of weeks.