In Canada we have pretty harsh winters. So my plan is to place them in a room I don't heat during winter. It's cold but not freezing. From what I read a good dormancy temperature is about 5°. Honestly no idea if that's accurate tho. But the cold room is the best I can do anyway. I doubt they would survive outside at -40°.
I didn't know dormancy was about the amount of light. Interesting ✍️
