Mills Cal MagShould the generous amount of magnesium and calcium found in mills basis A&B not be sufficient, calmag can be the solution for any deficiencies. Calcium and Magnesium are essential for photosynthesis and nutrient absorption. Should the plant be not growing as it should, a deficiency in these minerals may be the issue if your plant has stunted growth, curl edged leaves or leaf yellowing? Calmag ensures the plant has the additional minerals it may be