Panicle hydrangeas like these bloom on the current season's growth so pruning or cutting back can be done safely from fall through early spring without concern for flowering, although in colder zones, I'd wait until late winter or early spring.

But unless a compact or dwarf cultivar, these are big shrubs and will just grow back to their intended size.

I think your hydrangea looks great!! If it is impinging on other plants, I'd move them rather than whacking back the hydrangea.

Thank you, I love the way they look. I guess I am just not sure how much to prune or cut them back. I certainly dont want to whack them back.

Appreciate the help.

Other than deadheading - cutting off the faded blossoms - which can be done any time you like, I wouldn't cut them back at all.

But it is your choice.

My hydragena looked just like yours. then we had two major storms and now it flopping badly. bush and flowers have finally dried but the branches didnt bounce back. should i prune some of the flower heads off?

Feel free to deadhead the spent blooms at any time of the year. The only time that I would recommend deadheading soon is when the plant suffers from fungal infections and the leaves and blooms may be full of spores. Flopping is hard to avoid when the plant has large, dense, heavy panicles like Limelight, Vanilla Strawberry, Phantom, etc. can produce. Stake the stems now or in late fall/winter, when the shrubs lose their foliage and you can clearly see the internal structure of the shrub. You can also use tomato cages, peony hoops, plant ties for plants, lasso the stems, etc. You can also plant cultivars that have smaller, lacier blooms and-or stronger stems. Planting hydrangeas by themselves can promote flopping if the area is windy while planting in front of walls and between two plants may help mitigate flopping. Cultivars with lacy, smaller blooms may be better if this is a big problem for you: Pinky Winky, Baby Lace, Brussels Lace, Chantilly Lace, etc.; just select one whose dimensions will work for you.