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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.
You want to avoid stimulating late soft growth which will not have time to harden sufficiently before winter. This has nothing to do with the type of fertilizer or with frost dates in your particular climate. Miracle Grow, despite millions in advertising, is not a good fertilizer for azaleas and rhododendrons. It's the exact opposite of the slow, steady availability of nutrients these plants want.