Need advice for storing potted trees during winter
I went all out and bought about 40 trees: Apples, peaches, pears, cherries, plums, medlar, pawpaws, mulberries, etc. I also got gooseberries, strawberries, grapes, currents....the list goes on.
We planned on taking out all the shade trees in our yard and planting them, but my dh had to have shoulder surgery and we have not finished the task. Currently everything is in pots.
I have a spare room above my garage that is unheated and unused at the moment. I was thinking that this would be a good place to store them for the winter. It gets very cold up there, but no wind. There are also windows for light. I have no idea how low the temperature gets in the dead of winter in the "upper room", but it won't get as cold as the outside. the lowest it has ever gotten outside here is about -20.
My specific questions are:
How cold is too cold for the roots in the pots?
Should I water periodically during the winter?
Should I provide any other protection for the roots and trunks of the trees, and the berries?
We have had a few mice, but no big problem. Should I do anything about pests?
I invested probably a grand on these trees and I don't want to loose them. Your help and advice is appreciated!