Re: single deep wintering
We used to do it on occassion. We would place a plywood board on a single and put another often smaller one (to benefit from the heat) on the top and winter them as a double. As gmcharlie points out it is a tricky getting the right balance of bees and feed. One problem with our method was that you needed to check them for feed in the late winter/early spring and had to disassemble the packing to get to the bottom hive and that was a problem if they were sitting in snow or ice.
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