What is NPK? Understanding the Numbers on Fertilizer for Cannabis

Ever wonder what the three numbers on the front of plant fertilizer and cannabis nutrients stand for? That is the N-P-K ratio, or the ratio of the three main macronutrients that all plants need to grow: Nitrogen (N), Phosphorus (P), and Potassium (K).

Different plant feeds have different ratios of N-P-K because different types of plants need different ratios, and some plants need more of certain nutrients during certain stages of growth. Cannabis is no exception. In fact, it’s extra…

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