Nutrient elements necessary for the growth and development of flowers refer to various substances absorbed from the environment during the life cycle of flowers, which are assimilated in the body to form energy substances necessary for flower biology or flower life activities or play a direct or indirect role in the metabolism of flowers, thus creating good nutritional conditions for the growth and development of flowers. The floral composition is complex, but 16 elements are necessary, such as carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, boron, manganese, copper, zinc, molybdenum and chlorine. When their content is insufficient or lacking, the growth of flowers will be inhibited. The contents of 16 nutrient elements in flowers vary greatly, among which the contents of carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium and sulfur are high, which are called "macro elements" and the contents of iron, boron, manganese, copper, zinc, molybdenum and chlorine are low, which are called "trace elements". Among them, nitrogen, phosphorus and potassium are the most needed by flowers, but the effective content in soil is less, so fertilization is needed to meet the growth needs of flowers, which is called "three elements of fertilizer"

Although the relative contents and demands of various nutrient elements in flowers vary greatly, they are all necessary, and the physiological functions of various elements are equally important and irreplaceable. Therefore, both macro elements and trace elements have their special physiological functions and are equally important. When the symptoms of element deficiency appear, only applying this element fertilizer can restore its normal growth.