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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.
Joey Williamson, Clemson HGIC. Some nutrient deficiencies will also cause yellow coloration of azalea foliage, but if it all began during the cooler fall weather, it is probably just annual leaf drop. Donât fertilize azaleas in the fall to correct leaf drop, but wait until new growth begins in the spring.