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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.
Warnings. 1  Do not prune azaleas after mid-June or they might not bloom the following season. 2  Do not attempt to prune azalea bushes into shapes like squares. 3  Fungus can develop on azalea branches in late summer, resulting in wilted leaves and dead branches.