Pruning Hydrangea - Knowledgebase Question

Alta Loma, CA
Question by Temeharo
December 10, 1999
When do I prune my Hydrangea ( I'm new at this)
Also how do I cut them back? next to the knobs? How far down? I have them in tubs. In a shady area. Thanks so much. I've been afraid to do anything, for fear of ruining them. They're so beautiful when in bloom.


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Answer from NGA
December 10, 1999

0

There are several types of hydrangea, and the pruning techniques are slightly different. Hydrangeas can be identified by the characteristics of their leaves and flowers. Climbing hydrangea is a deciduous vine with long, green, heart-shaped leaves and short, stiff flowering branches with flat white flower clusters. Smooth hydrangea is a deciduous shrub with oval, grayish green leaves and white flowers in roundish clusters. Bigleaf hydrangea has thick, shining, coarsely toothed leaves to 8" long and white, pink, red or blue flowers in big clusters. This is the most often planted hydrangea. The Peegee hydrangea has green leaves that turn bornzy in the fall, and clusters of white flowers that slowly fade to a pinky bronze. Oakleaf hydrangea has deeply lobed, oaklike leaves that turn bronze or crimson in the fall. It has creamy white flowers in the spring. With the exception of Oakleaf hydrangea, which can be pruned to the ground each autumn, hydrangeas produce flowering shoots in the spring on last season's wood. So, to prune for flowering, reduce the old wood by one-half to one-third after bloom. The shrub will develop new flowering wood the following spring. Hope the above descriptions will help you identify which hydrangea you're growing!


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