My hydrangea plant has grown bigger every year, but it does not produce the blue snow ball flowers its supposed to, why?
Why Doesn’t My Hydrangea Bush Bloom?
Certified GKH Gardening Expert
These will, more than likely, produce white flowers, unless you use chemicals to turn the flower color. Here is an article to explain: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm
Now, the reason it is not flowering, is more than likely that it needs some fertilizer high in potassium, and phosphorus.