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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.
Fertilize monthly between April and November using fertilizer that is specifically formulated for acid-loving plants. Be careful not to overfertilize gardenia plants. Too much fertilizer can lead to salt accumulation, which can damage the shrub. Do not fertilize gardenias in the fall, which can stimulate growth.This tender, new growth will quickly die when exposed to cold winter temperatures.ertilize monthly between April and November using fertilizer that is specifically formulated for acid-loving plants. Be careful not to overfertilize gardenia plants. Too much fertilizer can lead to salt accumulation, which can damage the shrub. Do not fertilize gardenias in the fall, which can stimulate growth.