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bonsaiTALK Master Craftsman
Join Date: Jan-2002
Country: USA
Posts: 861
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It depends on what kind of trees you have. Temperate trees hardy to your zone should be fine with the pots sitting on the ground with mulch over the pots and out of the wind. The water in the rootball freezing isn't necessarily a bad thing but again it depends on the type of tree.
Tony
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