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Why Your Hydrangea Isn't Blooming

A healthy mophead hydrangea Photo by Lisa Rivers

Few sights are as beguiling to gardeners as a mature bigleaf hydrangea (H. macrophylla) covered with huge clusters of sky blue flowers. Because blue flowers are so unusual and beautiful, many of us believe that we can recreate this heavenly vision in our USDA hardiness zone 5 yards. And occasionally we are rewarded with gorgeous blue flower heads in June, but more often than not, these past few years have been hard on this species of hydrangea. 

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