My mophead hydrangea has lots of beautiful green growth, but no bloom. Why not?
To start off with, the Mophead hydrangeas are known as the “macrophylla” variety of hydrangea. These varieties should not be pruned in the spring. They set next year’s bloom buds in the fall. Another reason that your mophead is not blooming is that in colder growing regions such as Zone 5 or 4, these hydrangeas require enough warm days in the fall to allow the bloom buds to mature enough to withstand the cold winter. This usually does not happen and the bloom buds will turn black. The “Endless Summer” variety of hydrangea macrophylla is the exception because it is hardy to Zone 4 and blooms on old and new wood.
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