Our hydrangea's leaves have turned brown/black. Is this normal? Have just moved into our house and never had hydrangea's. I am not sure about care for them.
Hydrangeas love water, but excessive irrigation or wet foliage injures plants. Insufficient water causes leaves to turn black or brown. ... Prolonged moisture on foliage creates a breeding ground for disease pathogens, which leave black leaves.
This article will help you.