I just purchased my first single family home and have never owned hydrangeas before. We have a fence in the backyard and my wife wanted to line the fence with a variety of different hydrangea. I have been told that pruning is not necessary by some and others have told me to prune. The following might be too much information and I don't know if it helps or not. On both sides of the back gate we have the following in order mirroring each other - Japanese Vine Rose, Vanilla Strawberry, Nikko Blue, Preziosa Red, Bombshell, Royal Purple, and Endless Summer. In another area are pee gee, lime light, little lamb, little lime, wedding ring, bombshell, and Tokyo Delight. I obviously went a little overboard because of a huge sale at the nursery and am now a little worried because I had no idea they might need to be pruned and if so how to do it. They were just planted last week and I live in Northern VA about 15 miles from Washington DC, zone 7.