DNF Cal Mend is a specifically blended nutrient to correct or prevent common calcium or magnesium deficiency. Medical herb, peppers and tomatoes are known to be calcium, magnesium, and iron hungry plants. Don’t leave them with spotty or yellow leaves, or purple center stems, use DN Cal Mend and your plants will thank you. When growing using coco or reverse osmosis water, it is recommended to use our highly plant available calcium magnesium booster Cal Mend. Unrivaled value and unbeatable results, your lush green and healthy plants will thank you later.