We are in zone 7 and we only purchase trees for our zone. However, our weather can go from one extreme to the next in 24 hours and I think that change affects the trees. So if they are wrapped and insulated, the drastic change in temperature will not affect them as much.
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Yeah that makes sense. Wild temperature swings are not good for wintering 🌲trees. Also snow cover can help a lot. (If it stays all winter)