Oh my god. What an incredible plant.
I purchased this Bee Balm -- monarda didyma 'purple rooster' -- in Spring 2011 through the Arboretum's Plant Sale. I had never grown Bee Balm before, but I knew it attracted butterflies and was successful in my neighbor's yard (maybe too successful - I think she thins it out regularly), so I wanted to give it a try.**
Planted by the sunny vegetable garden, it sits in a bed of ajuga.
In late 2012, I moved it to the sunny vegetable garden area (facing south-west) because it was in the way of the patio and I didn't want it getting trampled on. Well... it loves it's new home. Almost too much because it shot up 42" tall and 2-1/2 ' wide with blooms all over.
They are a spectacular purple: deep, rich, magenta.
I think placing this where it's height and color will be appreciated (i.e. with other green plants) is the best option. It also has a lovely "romantic" cottage garden feel to it, as well.
The flower heads are large too.