I noticed that my Caryopteris was covered with bees the other day. I was glad to see it, since that’s why I planted it. Especially for the bumblebees, though there weren’t any around when I was taking photos.
I had several of these shrubs in front of my house when I lived in Sandy. In the mornings in the fall, I would go outside to see the bushes covered with bumblebees, which had slept on the bushes overnight and couldn’t fly because they were so wet with dew. It looked like the bushes were growing bumblebees. Once it warmed up and they dried out, they were off to fly about again.