Reminder: Prune azaleas immediately after they have finished their spring bloom period. It is okay to wait until all the azaleas in your landscape have finished blooming to prune them all at once. The best method is to use hand-held pruners and only remove one-third of the overall plant.
For in-depth pruning information, read this Extension publication: http://ow.ly/BfFP50J4mNm #GrowWithExtension #MSUext
Original source can be found here.