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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.
Soil conditions also should be considered in selecting a planting site. Azaleas require an acid soil pH (5.5) to grow properly. Check the soil pH of your site before buying azaleas. If the pH is above 6.5 you can expect to spend additional money and effort to maintain a pH in the proper range for plant growth.