Development of Monarda didyma flowers

First the bracts turn dark red...

Then the flower buds colour up...

...and grow larger.

Almost open...

...and here's a fully opened inflorescence in all its glory!

Bee balm is such an easy to grow plant, and attracts hummingbirds (though I have not seen this myself). I would expect that this is a healthier way of feeding hummingbirds than a feeder filled with sugar water, and lower maintenance too.