Emerald Harvest Cal-Mag keeps your plants productive and green in any growing medium with our top-quality calcium-magnesium supplement. Keep your plants productive and green with Cal-Mag, a calcium and magnesium supplement from Emerald Harvest. Containing top-quality ingredients, Cal-Mag is designed to nourish crops with extra calcium and magnesium and create the right conditions for abundant flowering and a heavy yield by utilizing its 2-0-0 NPK. This is especially important when growing in some media, such as coco coir, but any garden can benefit. Use Cal-Mag as a supplement to a base nutrient series for guaranteed professional results. Why Use Cal-Mag Calcium-Magnesium Supplement? Cal-Mag is especially important for preempting deficiencies when growing in certain media, such as coco coir, but any garden can benefit. Lush, vibrant, green growth and plant development Optimal chlorophyll production to support photosynthesis Less risk of calcium or magnesium deficiencies due to coco coir What Makes it Work? Cal-Mag nourishes crops with supplemental calcium and magnesium, fostering the right conditions for abundant flowering and a heavy yield. Calcium, which helps hold cell walls and membranes together Magnesium, the central atom of the chlorophyll molecule Kelp, a rich, natural source of proteins and biocatalysts