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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.
Azaleas are considered flowering shrubs of the rhododendron family. Azalea flowers bloom in the spring, but die back in the fall. Flower colors include white, orange, red and purple. These shrubs grow from 2 and 8 feet in height. Azalea bushes grow best in USDA hardiness zones 5 through 8b.