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I deadhead the flowers as they fade after flowering, but do not give the plants  a larger prune until about the same time as one would prune roses, approx. July in the Southern Hemisphere, and January in the Northern Hemisphere.
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Prune in late winter before bud generation begins. Since these varieties produce their blooms on new stems, you want to prune them in the winter before they start growing. This is the best time of year to prune new wood varieties, but you can prune them at other times of year as well - just avoid pruning them right before they're about to bloom in the spring and early summer.
  • You can cut back all the stems by 1/3 in the winter. Pruning at this time will help the shrub produce bigger, showier flowers.
  • However, many gardeners like their hydrangeas to have smaller flowers on sturdier stems. If this is your preference, do your pruning in the fall instead, to allow the plants to grow strong branches before blooming.
Prune just after the blooming peak. Since these types of hydrangeas start producing buds soon after blooming, in late summer and early fall, it's essential to prune them just as the blooms begin to fade in mid-summer. This way you can trim the shrub before it begins to produce the buds that will turn into next year's flowers. The longer you wait, the likelier it will be that you'll cut off some of next year's growth.
  • If you've missed this window, just wait until next year to prune the hydrangea. Hydrangeas don't have to be pruned every year, so it won't be a problem to wait.
  • If you're unhappy with your hydrangea's shape, you can go ahead and prune - just know that in doing so outside of the short midsummer window, you'll risk hurting it's appearance next spring.

 

by (500 points)
Very good, but it is better to trim in the early Fall
Always trim in early fall that way it will not shock the plant too much in thinking it is about to die

-birdy
by (24.2k points)

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