We had night time temps in the 20's last weekend. Unfortunately, I was sick and forgot to move my trees into the shed, so the soil froze. We will see in the spring how bad the damage was. Most of the trees are local species that I dug up from my yard, but I have a couple chinese elms as well. They were all bunched together on the ground, but I have taken some extra precautions for now. I am planning in building a bonsai bench (like
@jeremy_norbury) that I will winter my hardy trees under. Before building the bench, I excavated the area and placed my trees in it, and covered them with mulched leaves and pine needles.
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