This video highlights many techniques by which to protect your cold-hardy trees during the wintertime. It is by no mean an exhaustive list; it is merely a showcase of tried-&-true methods that I myself have used.\rbr\rbrPlants have evolved to be outside, so temperate zone trees should remain outdoors during the winter. However, bonsai trees are in shallow pots, which provides less-than-natural root protection. The pot allows more fluctuations in temperature, which can be detrimental to your trees. Protect them.\rbr\rbrPost your comments about how you store your trees during the winter - Id love to see them.\rbr\rbrFor some more information, check out Nigel Saunders video from one of his bonsai clubs: \rbrNigel is from the Great White North, and his winters are much more severe than mine.