Flowerbug, do you have a lot of honeybees? I have noticed a big increase in the bumblebee population since our honeybees almost all disappeared. I know that two different families within a 2 mile radius of us used to keep honeybees, and now they no longer do, so that probably explains their disappearance from my gardens. I have to figure that with greater food resources, the bumblebees moved in to fill the vacuum.
Our bee balm (aptly named) is blooming now and the pollinators are having a field day. I took a video the other day that I'll try to post. I love to watch them! I could stand out there looking at them all day. The video shows bumblebees, fritillary and tiger swallowtail butterflies, and a hummingbird moth. I'll see if I can get it to post.