It seems to be doing fine. Some of the blooms are changing colors to beige/green and others are flat out turning brown. Being a newly planted shrub, its blooms weigh and the stems cannot yet hold them blooms up so the blooms make the stems bend some. All seems normal for a plant that was planted recently and that is undergoing transplant shock.

It would help to add organic mulch, about 3-4 inches up tp the drip line. That way the soil will stay moist longer and you will not have to water so often. You can use hardwood mulch, pine bark mulch or pine needles. Do not fertilize until next year as newly planted shrubs probably have these round fertilizer pellets already mixed in the potting soil.

Here is a link that might be useful: Hydrangea Care Information

The blooms look spent to me, probably from blooming early in a nursery. Cut them off and they won't weigh down the plant as much. If the plant doesn't rebloom it certainly will next season. Just keep an eye on leaf wilt...

The blooms look spent to me, probably from blooming early in a nursery. Cut them off and they won't weigh down the plant as much. If the plant doesn't rebloom it certainly will next season. Just keep an eye on leaf wilt...

How much of the stem should I cut off? And what is leaf wilt?