This is called "rejuvenation" pruning. The best time to do this is right after they bloom. In my area that's now (yes, I'm wearing a light down coat...it's New England). New growth should start to form within a few weeks. I did this last August to a couple of mine - not the ideal time but hey, it happens! They are coming back strong right now, with tons of new beautiful growth. I expect a few buds by the end of the season and flowers next year. Some buds are starting to form. This works for azal

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