Question
I have a large hydrangea shrub that has only had two blooms the last two years.  Any idea how I could make this large shrub produce more blooms?  I have been giving it Ironite in moderation this year.  I have other hydrangeas in the yard that are really covered with blooms.

Answer
It could be any number of reasons, trial and error is the best method to find out. start with sun angle (exposure) compared to the others then increase nutrition fertilize with higher phosphorous, check soil fertility for nutrient lock out.  Good Luck  Larry  ;-)