Bee Balm. Bergamot. Monarda didyma ‘Prarienacht’ (‘Prairie Night’) has aromatic foliage (used to flavour Earl Grey Tea) and dense heads of purple flowers in late summer. They grow best in a moist light soil, with the flowers lasting much better if they receive only morning sun. The flowers are carried in dense terminal heads, surmounted by leafy bracts, where they open in rings like so many prawns n a prawn ring, each flower gaping out like a snake about to pounce. The Upper petal is narrower than many Labiates and gives Monarda a very distinctive look. The name Bee Balm aludes to the fact that bees are attracted to the profuse nectar produced.