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Learn what NPK stands for on a fertilizer label. Determine how the numbers on a fertilizer bag and other ingredients may impact your garden.| The Spruce
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This overview of organic, inorganic, and synthetic nitrogen fertilizers helps you determine what is best for your plants.| The Spruce
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Blood meal is popular with organic gardeners as a fertilizer, but it has other uses, too. Find out what it is and when to use it in your garden.| The Spruce