Rhododendrum - Knowledgebase Question

Oak Park, Il
Question by davidlehman
March 29, 2010
I would like to know how best to trim these back and when.

Answer from NGA
March 29, 2010


Rhododendrons flower in the spring, most around Mother's Day. Wait until the flowers are spent and then do your pruning. You can prune off just a few inches of the growth all around your rhodie to keep it compact and attractive or you can completely remove some of the branches, all the way down to where they attach on the main stem. The key is to remove less than a third of the live material during your pruning session. If you remove more, your rhodie will take a year or two to recover and you may not have flowers during that period of time. Best wishes with your rhododendron.

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