I have an established mop head hydrangea which blooms every year. This year the flowers are smaller than usual. What should I do to ensure large flowers next year?
Hydrangea Flower Size
Certified GKH Gardening Expert
Pruning could be a factor. Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm