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DERIVED FROM: Kieserite, Gypsum

Ca 4%, Mg 1%, S 1%


Cal-Mag is a liquid supplement that provides much-needed calcium, magnesium to both hydroponic and soil-based plants. Roots Organics CalMag is a pure and all natural blend of calcium, magnesium and sulfur to support plants during fast growth. The micronutrients in Cal-Mag are primary ingredients needed by all plants but especially by plants that bloom or produce fruits or vegetables.By creating a product free of added nitrogen, phosphate, and potassium, we give you control to supplement as needed without affecting your use of fertilizers. Roots Organics CalMag is ideal for fast-growing and heavy feeding plants.



Seedlings and Small Plants
Use 1 teaspoon (5 ml) per gallon.

Mature Vegetative Plants
Use 1 – 3 teaspoons (5 – 15 ml) per gallon.

Mature Flowering Plants
Use 2 – 3 teaspoons (10 – 15 ml) per gallon.

Roots Organics Cal-Mag

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