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Hi, I'm quite new to this. Last winter was my first with any sort of bonsai (just in the pre-bonsai stages). They were Picea and both managed to survive the winter, though not well due to some improper care in the previous growing season (my bad). This year I have aquired some American Plum species and would like to know how best to care for them through the winter months. They came from a nearby community that occasionally gets to like -25°C, but where I am seems to hit -40°C a couple times throughout the winter.
Last year, I had mine inside a non-heated workshop in a black plastic bag (based on a video I watched), with the rootballs surrounded/covered in wood chips.
Mainly, I'm looking for advice/stories from anyone who's cared for bonsai in extremely cold regions like mine. Thanks in advance for any responses.

If you get a lot of snow, just put the tree up to a north facing wall and cover it in snow. Under just 20 cm of snow the temperate is just a few degrees minus.