What is happening to my hydrangea?
This is some kind of a hydrangea. My husband bought it 10 years ago and can't remember the name. It blooms early spring and then not again. It had gotten so big that last year we gave it a good pruning. I don't know if we over-pruned or if the dry winter was too hard on it or . . .? One half of it looks dead although when you get close some branches did produce small buds that never opened. Some greened out and flowered but then two weeks ago the leaves on part of the relatively healthy-looking part crisped into brown/red. I hope this picture is fairly clear. I'm not sure whether to cut it all way back, leave it alone and see what happens next year, or if it's diseased and should be removed. Any guidance appreciated.
Hennepin County Minnesota