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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.
Step 3. Apply granulated fertilizer that is specially formulated for azaleas around the base of the plant approximately six weeks after the first fertilizer application in the north and eight weeks in the south. Do not fertilize azaleas later in the season than is recommended for your location. 2  The tender new growth will not have enough time to harden off before winter and may be killed off by cold weather, thereby reducing the number of flowers the following spring.