1.Old Wood Blooming Hydrangeas
Big Leaf - Mophead and Lacecap
Prune in summer or early fall when the blooms are spent. Remove up to ⅓ of the stems each year. Remove the weakest old and new shoots by pruning them at the ground or back to the main trunk.
Oakleaf hydrangeas do not require pruning. Trim them up lightly after they are done flowering if you want a cleaner look.