What should I do to make my 10yr old hydrangea bloom?

Audrey
by Audrey
I have a old huge hydrangea that blooms very little. This year I I had 4 Flowers. Several years ago when this started, I tried cutting it back in fall, thinking this was the problem . No blooms at all . Was told by a nursary that it probably blooms on old wood. Than I tried BLOOM BOOSTER several times in spring. Did this several springs, still doesn't produce the beautiful flowers . What next??

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