Hi Elena,

There's a great article on this forum that may answer your questions. http://www.learning2bonsai.com/articles/12-seasonal-care/72-winterizing-your-bonsai

I winterize my bonsai tree in my garage. A shed would also be a great place to winterize a bonsai. I've even heard of people placing their trees on the stairs near their bulkhead doors in the basement.

I would not remove your plants from their pot and the pot should not crack during the winter months. I live in Boston and leave the plants in their pot and they have never cracked.

Let us know if the article referenced above is helpful and/or if you have additional questions. I'll try my best to walk you through the process. thank you