The blooming of hydrangeas is affected by how they have been pruned, which depends on the type of hydrangea. Some bloom on second-year wood, others on the current year’s growth. Not knowing the type you have or how it has been pruned, I can’t say for sure why it isn’t blooming. Try fertilizing and determine its pruning requirements—the answer could lie there.
The blooming of hydrangeas is affected by how they have been pruned, which depends on the type of hydrangea. Some bloom on second-year wood, others on the current year’s growth. Not knowing the type you have or how it has been pruned, I can’t say for sure why it isn’t blooming. Try fertilizing and determine its pruning requirements—the answer could lie there.