Answer: Apparently your Pee Gee Hydrangea (Hydrangea paniculata) has been trained as a tree, a lovely way of growing one of these shrubs. This type of hydrangea blooms on new wood so you will not hurt anything by taking as much stem as you need to for your dried flowers. It would not harm it to cut them all off. You may also prune the plant for shape as needed in early spring or late winter each year. Incidentally, you may want to experiment with cutting the blooms at various stages of maturity. In my experience, those cut in the ealier stages seem to dry better.
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