Is it safe to use fish emulsion on Azalea?
To properly fertilize your Azalea you should have your soil tested.
Without a soil test, use a balanced fertilizer.
Remember that Azalea have a shallow root system and can easily be damaged by fertilizer.
Most times your soil with a dressing of organic material or mulch is often all that your plant needs.
If and when you fertilize, I recommend once before blooming and once following blooming and use half strength.