Thanks! I was feeling a but nervous sad I do want a fall display. I will deadhead them now.

I like how the blooms age and leave them be

Pennlake, since I have never grown these before. Will the plant have more blooms even if I don’t deadhead? I am not set on deadheading. Trying to figure what is the most aesthetically pleasing.

Feel free to deadhead them at any time that you cannot stand the color of the blooms as the blooms can be deadheaded at any time of the year that you prefer. They develop new flower buds somewhere around mid/late spring (or early summer in the northernmost locations) and then they immediately open blooms so if you want, you could try to avoid that time to ensure no flowering disturbing effects during that time. Pruning though, is another subject and it should be avoided around mid/late spring (or early summer in the northernmost locations). Pruning is not mandatory. If you do not want to add yet another gardening chore to your Gardening To Do List, you can also do no deadheading as well and then Mother Nature will deadhead for you, The catch is the blooms may say attached to the stems longer but eventually the peduncle decays enough so the blooms fall. There are no measurable benefits to deadheading early; you will not get a second flush of blooms. Hydrangeas usually only produce one bloom per stem ending per growing season.

I don't see Annabelle showing any tendancies to rebloom in my climate, but give it a shot and see what happens. Some of the newer Hydranagea arborescnes selections show some rebloom here.