I have a cone shaped dogwood bush in front landscaping. It died out in middle and now I want to replace. I already have a small hydrangea in another flower bed but this hydrangea was there when I purchased home. It is no more that 1 1/2 feet wide/tall. I like this height but do not know which hydrangea it is. The bloom is light blue but leaves grow on old wood. Does anyone have any suggestions.