Autumn olive (Elaeagnus umbellata), a nitrogen fixer, has almost waxy-looking fragrant flowers that the bumblebees love. It can be invasive in the eastern U.S.
Comfrey flower opening up
White Campion (Silene latifolia), another non-native, but it pops up just about everywhere. If it's not in the way, I let it stay.
Bumblebee, proboscis hanging out, zooms in on catmint. Catmint is a true bee magnet. She can't resist.