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Stunning, I find only taking off the dead flower heads round the time of the last frost and not really trimming them unless 100% necessary is best.
They mostly bloom on old wood so if you take off the old wood, you're taking off this years flowers too. The Vitax slow release Hydrangea feed arround the time you dead head also works wonders.
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We're also enjoying the first full bloom of our hydrangea after some aggressive pruning over the past couple of years. Got a couple of cuttings that have taken well too.
Went to RHS Wisley yesterday, some truly filthy hydrangeas on display.