The most common reason for hydrangeas failing to bloom is winter injury. Other reasons may be too much shade, poor fertility and too much nitrogen fertilizer.
They like acid soil and don't let the soil dry out too much in summer. They also like shade. Some only bloom on last year's growth so if you are cutting them back in fall or they are being killed by the weather, they never will bloom. You need the variety that blooms on new growth.
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http://www.millionplants.com/advice/wont-hydrangea-bloom/
The most common reason for hydrangeas failing to bloom is winter injury. Other reasons may be too much shade, poor fertility and too much nitrogen fertilizer.
See if you don't find this informative, friend:
http://www.clemson.edu/extension/hgic/plants/landscape/shrubs/hgic1067.html
feed them....banana's....coffee...tea.....etc
They like acid soil and don't let the soil dry out too much in summer. They also like shade. Some only bloom on last year's growth so if you are cutting them back in fall or they are being killed by the weather, they never will bloom. You need the variety that blooms on new growth.