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Best Time to Fertilize Hydrangeas, Azaleas, and Peonies

The ideal time to fertilize most spring-blooming shrubs and perennials is when they begin active growth in spring. A general guideline: apply 1 tablespoon of 10-10-10 per foot of plant height in March, May, and July.

Stop fertilizing by late July to allow plants to harden off before winter. Always water in fertilizer thoroughly.

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