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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.
When to Prune. Timing is critical if you want your azaleas to bloom next year. The best time to prune is within a three week period after they finish blooming in spring. This gives the azaleas plenty of time to make flower buds for next year. If you prune in summer or fall, youâll cut off the flower buds and assure green blobness next spring. How to Prune. DO NOT (repeat) DO NOT USE HEDGE TRIMMERS to shear azaleas into tight boxes. This looks awful and results in foliage and flowers that exist only on the outer inch of the shrubs.