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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.
When to fertilize. To get your plants off to a good start, fertilize when the spring growing season begins. Many gardeners use a general-purpose fertilizer at this time (either an evenly balanced formulation or one slightly higher in nitrogen); others add only nitrogen. How often you fertilize later in the year depends on the plant.