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Fertilizer Basics: Organic Fertilizer, NPK Ratio ...

How to Choose a Fertilizer. In most cases, an all-purpose, 5-5-5 fertilizer will provide the nutrients all plants need for healthy growth. If a soil test reveals certain nutrient deficiencies, or if you want to tailor your fertilizer to the needs of particular plants (tomatoes vs. flowers), you can select a special formulation.