When do I trim rhrodadendrums?
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I trim mine right after they bloom and then again in the fall. I live on Oregon coast.
This is a great site I refer to often. Here's the article that may help you: http://www.harvestpower.com/best-time-prune-azaleas-rhododendrons/
Right after azaleas and rhododendrons are finished blooming is the best time to do any pruning they may need. These shrubs make blooms that flower on the prior year's wood. So you have to be careful when pruning them since buds for next spring will be made this summer, and you don't want to prune those off.