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Harvest Hero Enhanced Perlite Mix has 2 macronutrients in the mix — phosphorus and potassium and is expected to last 6 – 8 weeks or even up to 1 year depending on the plant. The phosphorus and potassium stays put in the soil column until it’s ready to be used by the plants. If the plants are heavy feeders, expect a shorter cycle compared to a normal plant which requires only minimal amounts of phosphorus and potassium. With a normal plant, the nutrients can last up to one year. If you’re growing cannabis, which is considered a heavy feeder, expect the nutrients in the Enhanced Perlite Mix to last 6 months if you mix 20% of Harvest Hero with potting media.