The answer, by the way, is I don’t know. (I might update this post throughout the summer instead of writing follow-up posts. Updates will appear at the bottom.)
All of my honey bee colonies this year seem to ignore the bottom entrances to their hives. Here are some photos I just took of one of my colonies — my one and only colony that I think is in good shape — where the bees often fumble over each other trying get in through the top entrance.You can see I even use a deep with an extra entrance hole to entice the bees to use a lower entrance. But nope. They pretty much ignore the hole too.
I’ve done a lot of reading and I’ve talked to several beekeepers and I honestly don’t know who or what to believe. I’m not too concerned about it. My guess is my usual guess about this type of thing: The bees will do whatever they need to do whenever they need to do it. They know what they’re doing — even if I don’t. And as long as they’re not preparing to swarm, I’m totally cool with it.
Nonetheless, does anyone reading this have any ideas?