Cut back hydrangeas? - Knowledgebase Question

Silverdale, WA (Zone 7B)
Question by erinkwillis
January 16, 2007
I am renting a house in Silverdale, Washington. There are two hydrangia plants in the back yard that bloomed blue/green blooms this past summer. The plants appear dead and dried out now (I'm assuming from the cold and snow we've been having, but also I did not water them enough this dry summer)and I'm wondering if I should prune them, and if so, how much and when? I do not know what kind of hydrangeas they are.


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Answer from NGA
January 16, 2007

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The plants are probably hydrangea macrophylla, or big leaf hydrangea. These plants produce new flowering shoots on old wood. Wait until spring when the leaf buds just begin to swell and then prune. You can cut them back to about 18" above ground level (remove some of the oldest canes in the center of the plant to help renew it, and shorten the remaining canes to about 18"). New growth will emerge from these shortened canes and you'll get flowers on each of the new shoots.

Best wishes with your landscape!

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