““Fertilizers all have a combination of nutrients in them. Most of them have the “Big Three” macronutrients: nitrogen (N), which promotes green leafy growth, phosphorus (P), which strengthens roots and flowers, and potassium (K), to help with flavor and hardiness. Some fertilizers have micronutrients such as calcium, magnesium, manganese, and iron. Fertilizer labels include what is called an “analysis,” which is the percentage of each of the “Big Three” nutrients contained in the product, listed in order of N-P-K.””