Answer: There are several reasons for non-blooming in hydrangeas. Immaturity is the first, lack of sufficient sunlight (4 hours of morning sun is ideal), pruning at the wrong time - big leaf hydrangeas produce flowering stems on old wood; if you prune too late in the spring or if your hydrangea freezes down to ground level each winter, you won't have any flowers. The final cause is over-fertilization which can result in lots of lush, green growth but at the expense of flowers.
Hope this information helps you determine just why your hydrangea is not flowering.
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