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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.
Fertilizing. 1  In fertile soils rhododendrons and azaleas can be grown without receiving further fertilization. 2  In cold climates, nitrogen fertilizer should not be applied after late June as it may promote new lush growth susceptible to winter damage.