Non-honey bees

Last week, I was observing bees in a garden. Among other plants, there were two flowers, looking more or less the same to me. One was visited by quite many bees, and the other was abandoned. After a moment, I saw a male bee zooming around it. Maybe it was a coincidence, but males of some bee species are well known for their aggressive defence of their territory. Maybe the other bees just didn’t want trouble.