What causes hydrangeas to not bloom?
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I have the same problem and was just looking at this- https://www.youtube.com/watch?v=QgGcg5uvAyI and apparently the biggest problem is when to prune because not all hydrangeas are the same.
Yes pruning is the culprit. You might just leave them this year and see when they bloom next year and then prune.
The soil is to acidic, check the Ph levels.
The hydrangeas I have bloom on old wood. I never prune the old wood until after they have bloomed for the summer. Some bloom on new wood. You need to determine which kind you have. https://www.gardeners.com/how-to/pruning-hydrangeas/8852.html My Mother and Grandmother never pruned theirs at all.
See link for the information you were looking for
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm
Thanks for all your help!