In the spring, I planted some Bombshell Hydrangeas. Throughout the summer they looked great. Now that the summer is almost over, most of the blooms have been spent and most of the remaining blooms are touching the ground. My thought was that I should remove the remaining blooms to allow for the new plants to focus growth on the foliage. Also, does this type of Hydrangea grow off of old stems? Will hard pruning in the spring result in new growth?