This is what happens when lazy journalism meets cold weather.Predicting higher than usual overwinter losses.
The final sentence........
I try to make sure that several middle frames in the lowest brood box contain partially empty comb at the end of the season. Above that, in additional boxes, capped honey. Then, when the clusters form, they should form at the edge of honey, in empty comb. As honey is consumed, typically, the cluster moves upward to stay in contact with the honey.Where, within the nest.
What about plastic frames or foundation? Does heat transfer through the thick plastic? If not, just wondering if plastic might not be the best choice for overwintering. Never really thought about it.They have to be able to fill up the cells and all empty space in the cluster with bees in order to maintain cluster temperature. Full slabs of honey prevent this clustering.