I have read, on the forum, of various methods for protecting plants like basjoo over the winter. One was to dig plants up, and put them in a crawl space, etc. I have a basement room that we hardly ever use that has only an in the wall electric heater. The heater is expensive to run, so we usually only turn it on when we are in the room. Our house is on a slope, so this room is at ground level, and you can walk out through a pair of glass patio doors.
If we don't turn the heater on, it can get down to about 50°F in there. I decided to try a few basjoos in there, this past winter. It seemed warm enough, today, to see how they did. I took them outside, and everything was fine. Three were green right up to the top cigar leafs. I had to cut about 6 inches of stem off of another.
These things were in containers, but I didn't want to waste a lot of space dragging big pots inside, so i took them out of their pots, shook most of the soil off the roots, and stuck them in black plastic garbage bags. I trimmed them up, and stuck them in a large container for now, as the extended forecast says we might get another 38° night next weekend. If needed, I can bring them in again for anothe night or two.
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Some even have some nice pups started. The pink thing nexto them is a 12 inch ruler.