Cannabis plants require various nutrients to thrive with primary nutrients including Nitrogen (N), Phosphorus (P), Potassium (K), often seen on fertilizer products with the ratio indicated as N-P-K. Other micronutrients that help marijuana thrive include Calcium (Ca), Magnesium (Ma), and Sulfur (S). Outdoor growers will often add nutrients in a powder form, whereas indoor growers will typically mix nutrients with the liquid solution. Indoor nutrients should not be used for outdoor growing plants as they are often composed of synthetic mineral salts that may damage the bacteria in the soil.