Description Cal-Magic Calcium is an essential plant nutrient, it is required for structural roles in the cell wall and membranes. Magnesium fulfills several functions within the plant; it is a central component of chlorophyll which is supporting the function to absorb sunlight during photosynthesis. Strengthens the cell walls of the plants allowing for strong stalks, stems, and thick, lush leaves. Kills pests and powdery mildew on contact. All nutrients are absorbed by the tissue of the plant, resulting in maximum nutrient uptake. Usage and Directions: Apply once daily until deficiency is rectified. As soon as the lights go off for indoor or late afternoon for outdoor, lightly spray all the leaves so they are covered with the foliar spray. Do this application in the clone and vegetative stage.