If you still see green foliage, it is not a lost cause. Prune off stems and foliage that are clearly dead or dying. Set up a hose at the shrub’s drip line and turn it on to a low trickle. Let it run for a few hours so the plant gets a nice deep drink. Move the hose a few times so you are targeting the whole root zone. Be sure, too, your plant isn’t sited in direct sun. Hydrangeas prefer partial shade.
If you still see green foliage, it is not a lost cause. Prune off stems and foliage that are clearly dead or dying. Set up a hose at the shrub’s drip line and turn it on to a low trickle. Let it run for a few hours so the plant gets a nice deep drink. Move the hose a few times so you are targeting the whole root zone. Be sure, too, your plant isn’t sited in direct sun. Hydrangeas prefer partial shade.