Apart from Nitrogen (N), Phosphorus (P) and Potassium (K), Calcium and Magnesium are essential macro-elements, used in relatively large quantities by plants as a nutrient solution. These supplements are not only be used for soil plants but they are super important for hydroponic gardens as well. Plants typically take up more calcium than phosphorus. Calcium builds strong stems and leaves and flourishes plant growth. When calcium is taken up by the plant, it forms pectin, the glue that binds cell walls together, so a steady supply of calcium is necessary throughout the plant’s life cycle to strengthen its vascular system, produce thicker stems and build new cell walls at the growing tips.