Why No Blooms On My Hydrangea. If you want to grow an Endless Summer or one of the other repeat-blooming hydrangeas and you live in a zone 4 or 5 here are some tips for success. Hydrangeas like so many other flowering plants need phosphorus in order to properly bloom and flower.
If you cut back a hydrangea between the autumn and early spring and it blooms on old wood you have trimmed off all the future flowers. Thus lack of sunlight could explain why a hydrangea is not blooming. The other reason that hydrangeas dont bloom is pruning at the wrong time.
01032017 Many customers ask why their hydrangeas arent blooming.
Thus lack of sunlight could explain why a hydrangea is not blooming. Fortunately many of the common issues that keep hydrangeas from flowering have simple fixes. Lets start with pruning Hydrangea varieties can be of the type that blooms on old wood new wood or both. Conditions like extreme heat drought or excessive sun exposure can all impact how many flowers your shrubs produce.