Answer: This hydrangea is obviously in an ideal location where it has been happy for a long time. These plants have few disease problems. You may be seeing a bacterial or fungal blight aggravated by the wet spring, but this is doubtful. If this is the problem, it will most likely go away in time and not be a long term problem. Some sanitary pruning to remove diseased areas could be of benefit.
Could it be that something has changed the environment around this plant, such as an overhead tree removed, gutters added to the home to change the seasonal soil moisture content, etc.?
I think the problem will go away. If the problem does not get any better by mid summer a disease control spray may be needed. Visit us again, and we'll try to help, or you can work with a local nursery to develop a plan.
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