Mountain mint belongs in Summer gardens, and not just because its silvery bracts are showy from July through September. The heads of tiny flowers are such a favorite of bees that, at first, it seems that the colony is shimmering.
Rather, countless insects are in motion, scrambling atop each flowerhead as well as flitting from one to the next. Their wings set air in motion, plus they land and take off in haste. The collective force flexes the flowerheads back and forth on their supporting stems.
The colony is vibrating!