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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.
If you plant your azaleas in the spring or summer, apply fertilizer after planting. However, if you planted your bushes in the fall or winter, don't fertilize them until after the spring.tep 2. Fertilize using azalea fertilizer or azalea feed, as marked on the packaging. There are many brands of azalea feed and fertilizer, so read dosing instructions carefully. Generally, about a tablespoon of fertilizer is needed per plant.