Nov 28, SWAMPSCOTT (CBS) – Call it the mystery of the hydrangea cutting. If you take a close look at the plants at two houses in Swampscott. These shrubs can be pruned in early spring, fall or winter but not when preparing to bloom in summer. They do not need to be pruned every year. However, they can be pruned to the ground every year once established to encourage vigorous new growth or pruned to one-third to one-half the height to form a tidier bush with smaller flowers. Nov 29, SWAMPSCOTT, MA - Hydrangea bushes at the Swampscott home of Dewey and Joan Spofford have been vandalized again, one year after someone cut the flowers off their plants, according to CBS Boston.
Apr 26, Generally, they are pruned in late summer, after blooming has ceased. However, some people prune them in fall while others do so in spring.
As long as you do not cut any stems that have not bloomed, leaving healthy buds intact, they should be okay. Prune weak stems to the ground and cut or deadhead spent flowers and stems to the last bud. Jun 23, Avoid pruning after August 1, because the flower buds for next year’s blooms form in late summer. To encourage branching and fullness, cut one or two of the oldest stems down to the base. If plants become old, neglected, or damaged, prune the entire plant down to.
Most of the other hydrangeas should be pruned in summer, once they have finished blooming. Most of these bloom on what's called"old wood" - growth from the year before.
If you prune them in early spring, you risk cuting off the dormant flower buds. By pruning right after the blooms have faded, you allow the plant time to set buds for the next year.