I have a few patches of Ajuga reptans in the back yard that have been swarming with carpenter bees for the last couple of weeks. It’s a great match because both the bees and the plant are so aggressive. I got buzzed by a few bees while I watched and they were constantly fighting each other. The plant is spreading so quickly that earlier this spring I contemplated digging it out, but after watching the bees I’ve decided I’m going to let it go for now. It’s also an attractive evergreen groundcover and, for now, there is plenty of room for it to spread.