Hydrangea - mophead

There are five separate plants - two in one group and three together. They start off pink and become mauve to purple. They were planted 13 years ago - I am still looking for the name of this variety. They provide beautiful color in the front of the house all summer. This year they are adjusting to more sun since a large fir tree was cut down over the winter. They are doing well but require extra water on hot days.