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Understanding how and when to fertilize is an important part of growing marijuana. Each bag or bottle of fertilizer is labeled with a set of numbers representing three of the macro-nutrients used by plants. These numbers are always in the same order and correspond to the specific plant nutrients nitrogen, phosphorous, and potassium (N-P-K). If you hadn’t guessed, the symbols N, P, and K are the same as used on the Periodic Table of Elements. An exception to this method of labeling is found in Australia where a fourth letter is assigned for Sulfur (S).
