> I think it was Farrar who advocated wintering in three deeps.
I understand he worked with double deeps:
https://archive.org/details/productivemanage702farr/page/1/mode/1up
But he also suggested:
'The placing of a set of empty combs next to the bottom board and below the brood nest appears to increase the quantity [of pollen] accumulated, particularly if these are dark brood combs.'
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