Pruning Hydranga In April. - Knowledgebase Question

Name: toni bell
Pittsburgh, PA
Question by bell3
April 23, 2001
Can I prune my hydranga now in April for this summer's blooming. How should it be pruned and how much should it be cut back. Also, the kind of acid used to retain blue flowers?


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Answer from NGA
April 23, 2001

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The big leafed hydrangeas bloom on old wood, so any pruning should be delayed until the plants have leafed out fully. Then, remove only the oldest stems on overgrown plants, and any winter damage. In most cases using a fertilizer for acid loving plants is sufficient to maintain the soil acidity necessary for blue flowers. If you think the blooms should be bluer, it is a good idea to run some basic soil tests and then slowly adjust the pH based on the results. Your county extension should be able to help you with the tests and interpreting the results as well as advise what to use and how much of it at a time.

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