Years without a single flower
I live in central Massachusetts and have a mature 6yr hydrangea that will not bloom. It had a single bloom about 2 years ago and nothing since.
It was located in the front of the house (southern exposure) and received full sun most of the day.
This past spring we moved to the back yard where it gets morning sun and afternoon shade.
I haven't cut back the shots before winter because I am not sure what variety it is.
It a very deep green leafy shrub with plenty of shots, it just won't flower.