Well, one thing we noticed a few years ago. We had leeks, and when they bolted and the flowers bloomed, the bees - all sizes and types - would be buzzing all over those flowers. The beetles would avoid being where the bees were, and the bees ignored humans while they were paying attention to the leeks blooms. And my grandfather always said that bees keep the beetles away, and from what I saw he was right. Other than that I got nothing for you. :)
Interesting! I have never seen a leek bloom - I’m too busy washing them and then caramelizing them for later use on top of flat breads and pizza!
Our bee population is pretty good around here, but it can always be better, for sure. ;)