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Cut the dead or diseased stalk back to the base of the plant. Cut damaged stalks below the damaged part to leave the foliage to feed the plant. Prune the stalks back to the base of the plant in late fall when the lilies have stopped blooming and the foliage is dying off. Pruning shears.
First, you need to know what type of hydrangea you have. For mophead, lacecaps, and oaklead varieties, the best time to prune is actually in the summer before August. They form their buds on old wood in Aug/Sept/Fall for the following season's bloom.