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Potassium deficiency is a common problem in cannabis cultivation that can severely affect plant health and yields. Typical symptoms include yellow or burnt leaf edges (marginal necrosis), dark spots, curling leaves, and stunted growth. Main causes are: An incorrect pH value that blocks potassium absorption. Nutrient blockage due to excess of other minerals. Incorrect or unbalanced fertilization. overwatering. Treatment options: Check and adjust the pH value (optimal: 6.0–7.0 for soil, 5.5–6.5 for hydroponics). Use appropriate potassium supplements or balanced fertilizers. Flush the medium if nutrient blockage occurs. Avoid waterlogging and improve drainage. Prevention: Regular pH and EC checks and the...