The results of scientific research show that flowers need 16 kinds of essential nutrients for growth, flowering and fruiting. The 16 elements are carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, sulfur, calcium, magnesium, iron, boron, zinc, copper, manganese, molybdenum and chlorine. Among them, carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium and sulfur are called macro nutrients. Iron, manganese, copper, zinc, molybdenum, boron and chlorine are called micronutrients. 16 Each nutrient element has a special physiological function in the life activities of flowers. A large number of elements are necessary for flower growth, and trace elements are also indispensable for flower growth, which is irreplaceable by other elements.

The nutrient elements needed by flowers are not necessarily solved by fertilization, for example, carbon, hydrogen and oxygen can be obtained from water and air; The demand for trace element flowers is very small, and the content in general soil can meet the requirements; Elements such as nitrogen, phosphorus, potassium, calcium, magnesium and sulfur can be provided by soil. Because flowers need a lot of nitrogen, phosphorus and potassium, and the supply of soil often can't meet their needs, it depends on timely fertilization, so nitrogen, phosphorus and potassium are called "three elements of fertilizer"