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If a soil test reveals that nutrients are extremely low, fertilize azaleas in the spring or fall. Use a granular, slow-release fertilizer that is acid-forming and apply a very light scattering around the edge of the root zone of the plant.f a soil test reveals that nutrients are extremely low, fertilize azaleas in the spring or fall. Use a granular, slow-release fertilizer that is acid-forming and apply a very light scattering around the edge of the root zone of the plant.
A: Itâs best to fertilize after blooms begin to fade but there is more to it than that. Fertilizing azaleas should be based on how the plant appears and what you want to accomplish with it. Old, established shrubs donât need much food. A tablespoon of 10-10-10 per foot of height is sufficient for the year.Young plants need more food so feed them four times, at the same rate, during the growing season.: I continue to get mixed messages on when I should fertilize my azaleas. I have three of them, planted last spring.