When I reverse the brood boxes, usually some time in April, I don’t just pull the hive apart and reverse the positions of the deeps. (That’s an easy way to squish the queen, by the way.) I set up an empty deep next to the hive and, if it’s warm enough, carefully inspect each frame before I move it into the new bottom deep. No heavy lifting required. But more importantly, this allows me to assess the strength of the colony going into the new season and make adjustments on the spot if necessary. I will add drawn comb to the brood nest if the cluster looks like it needs room. I will add frames of honey or pollen if the bees are starving for it. I will give them frames of brood from another colony if they’re weak. In short, I will take whatever action is required to get the bees started on the right path for the new season.
Then for the rest of the year, because I know exactly what condition the colony was in at the beginning of the year, I’ll be able to assess the strength of the colony without having to dig into the bottom deep and disturb the brood nest every time I do an inspection. Are the bees filling frames in the top box with pollen? Is the brood nest straddling the deeps? I can tell a lot from looking down into a hive where the brood nest has been working its way up from the bottom.
It’s more difficult when the brood nest has been working it’s way from the top down. It’s more work, at least for me it is. I usually end up having to lift the top deep, essentially separating it from the bottom half of the hive, and potentially splitting up the brood nest, so I can see what’s going on in the bottom, to see how much the cluster has moved down and so on. In my book, that’s too much work and too disruptive. It’s much easier and less disruptive to the brood nest — if it’s seated in the bottom deep — to pull out a few frames in the top deep and look down to figure out what’s going on — and I never have to lift a deep or potentially split the brood nest if its straddling the deeps.
That’s why I reverse the brood boxes on most of my hives sometime in April. It doesn’t necessarily reduce the chances of a swarm, but it gives me an excuse to carefully inspect and assess the strength of the colony and perform future inspections with greater ease and less disruption to the brood nest.
I could be singing a different tune by this time next year, or even this time next week, but for now, this is where my experience with reversing the brood boxes has led me.