Trimming Oak Leaf Hydrangeas
Q: When should I trim my oak leaf hydrangea? How far back?
A: The best time to prune is right after the flowers fade, usually in late July. Remembering that the shrub wants to be at least 6 feet high, prune back to a height that gives it room to grow next year. Make your pruning cuts just above the spot where leaves and buds emerge from a stem