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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.
I reserve the inorganic ones for the plants that won't respond to the organic type. My azalea bushes require inorganic fertilizer. I suppose my soil must be lacking in something that they need, because they start to turn yellowish and refuse to produce blooms if I don't give them this kind of fertilizer.