Should I cut the dead blooms off of Clethra,Sixteen Candles? Does it only bloom once?

Question

Most off the blooms have passed and are a dry brown now.

Answer 1

Yes, you may cut the dead blooms. And yes, it will only flower once per year around this time. This article will help you to care for these slow growing shrubs: https://www.gardeningknowhow.com/ornamental/shrubs/summersweet/summersweet-plant.htm