Cal-Mag (Calcium and Magnesium) supplements are crucial for flowering plants, strengthening cell structure, enhancing nutrient absorption, and promoting healthy, vibrant blooms. They prevent common deficiencies like yellowing leaves or stunted growth and help plants resist stress from heat, drought, and pests. Overall, Cal-Mag ensures better flower development and robust plant health during the flowering phase. but this one seems not to work with my growing cause it needs to be used immediately after mixing, not to stay in stock tank for long.