Mt. Airy Fothergilla or witch alder is the gold standard for all Fothergillas. Michael Dirr selected it from Mt. Airy Arboretum 30 years ago and no other Fothergilla has appreciated like Mt. Airy - it stands the test of time.
White, 2" tall, bottlebrush-style flowers blanket Mt. Airy from top to bottom. It's covered in these cute, tiny bottlebrushes for a fairly long time - 3 to 4 weeks - in spring.
The term "kaleidoscopic fall color" is a bit hackneyed, but truthfully, I can't come up with a better term. Rather, I'll emphasize it and claim that fall color is extraordinarily kaleidoscopic.
It's unpredictably kaleidoscopic too. One year you might find red, orange, and yellow on the same shrub; other years the entire shrub might be red, orange, or yellow. More like a mood ring than a kaleidoscope? Any color, it's reliable for excellent fall color.