I am by no means a hydrangea expert, I probably spend about 78 percent of my gardening time babying the two I do own. I have killed 4, kept one alive, and the other is new and as of now doing well. I was worried it was just too hot here to grow them - I have Nikko Blues which can be pink so it could be what you have. I must say, though, that the one I have that has managed to survive looks better and stronger every year that it comes back- however the first year it came back it was puny. So, now I know that I can keep them alive. It is almost like a dance- they need so much more water than any of my other plants. I actually put the hose on a slow trickle right at the base of the plant and let it get deep watering everyday while I do other garden tasks. Since yours are so new they shouldn't need fertilized yet.

The one I bought this year- to replace one I killed last year- I accidentally left in my car in the afternoon heat (windows shut) for 5 hours so I am slowly rejuvenating it. I picked all crispy leaves, brown blooms and totally wilting stems off of it and give it lots of water. It has some new beautiful green growth, but I am not expecting any blooms this season because of the trauma. I'd keep trying to salvage yours and hopefully some experts will weigh in to help you out. I would not expect drastic results or beautiful flowers this season, though.

Mine get full morning sun and afternoon shade. They need the sun to produce blooms but in our climate must be shaded the hottest part of the day.