I agree with above posters. Reduce the stress on the plant by trimming off the brown bits. Water well, possibly twice a day, even if it has rained ( some hope!) Give it some soluble plant food.
Hydrangeas are very thirsty plants, you may not get any more flowers this season, but you will save the plant.
I have a growing collection of hydrangeas that I rescue ( cheaply) from the sick plant shelves. I don’t expect too much from them the first year, but they always respond to kindness!
I'm a bit stuck! What would you do?
From sinner to saint, quite a transformation.


