My Endless Summer Hydrangea bushes are producing smaller, but many, blooms. These bushes have always produced much larger blooms which I prefer. Is there something I can do to get the larger blooms again next year? I should state we were making the mistake of cutting these bushes down to the ground each fall, so were getting very few blooms. Last year we did not cut them back at all and I have plenty of blooms but small in size. Hoping there is a way to get lots of the big ones again!
A soil test will tell you for certain, but it sounds like your hydrangea will benefit from a slow release fertilizer that is high in phosphorous. Phosphorous is the middle number on the NPK ratio. Be certain to take a look at my hydrangea soil science video for tips for increasing the blooms on hydrangeas.