Part of the issue with how many brood boxes is climate. People in the deep South of the US usually run only one brood box and don’t seem to have any issues with that. People in the North usually run two deep ten frame boxes for brood and that seems to be about right. In the middle (say Tennessee or so) they tend to run one deep and a shallow for brood and that seems to work out about right. This leads me to the conclusion that bees in a warmer climate don’t build up as explosively as bees in a colder climate. It’s as if the bees sense that winter is coming so they work harder and the queen lays more eggs because they are in a race with winter. So one deep brood box has proven inadequate in cold climates.
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