I've grown a so called medium size hydrangea in another garden and was astounded how much larger it grew than the label advertised. It grew long, whip-like stems and produced beautiful flowers, but was difficult to manage near a sidewalk. Having grown a little wiser, I chose a shorter variety called Bobo and planted two in an island in our front garden. My question is this: Is it possible to keep Bobo down to 3 or 4 ft height and width? We are in central Virginia, zone 7a. The plants will be in full sun. Sure would appreciate your experience with this shrub. Thanks much.