Will it rebloom again this year? Unlikely, as only a very few selections are remontant or have the ability to bloom on both old and new wood. It is also probably not a dwarf - greenhouse, florist or forced hydrangeas are manipulated to bloom at a very early age and small size through the use of chemicals, growth hormones and very specific growing conditions. Once they are free of these and in a more natural environment, they will grow to a more normal habit and size, typically at least 4'x4', often quite a bit larger.

You can attempt to transition it to your garden but it will require winter protection to rebloon. It might make more sense to try and maintain it in a suitably sized container that can be moved into winter protection. But these plants are intended as floral gifts rather than landscape additions and are most often treated as 'growing' cut flowers for as long as they look good then tossed, especially in colder climates.

You can cut off the spent flower just below the heads or down to the first set of buds or leaf nodes below the flower.

gardengal48~

Thanks for the info. It was just a thought to carry it on. A container on the front porch I'll try and see what happens next year.
I thinks ES is the only one that grows on new wood.