Heading back will stimulate more new growing points. It is a known fact that the terminal bud secrete a growth-inhibiting chemical which move down to the lateral buds. These chemicals prevent the new lateral buds from growing, when cutting back the chemical is no longer available so the lateral buds start to grow. Usually, the buds just below the cut develop more, they in turn will start to manufacture the growth-inhibiting hormone to help prevent the growth of lateral buds farther down the branch.
Flowering shrubs are pruned by thinning out at different levels within the plant and cut the top back. Remove one or two branches all the way back to the ground. This will stimulate new growth from the root system which will help form a new plant. Don’t continue to prune at the same level year after … Read the rest