Agricultural standardization is a standardization activity with agriculture as the object, that is, the principle of "unification, simplification, coordination and optimization" is used to promote the rapid popularization of advanced agricultural scientific and technological achievements and experiences, ensure the quality and safety of agricultural products, promote the circulation of agricultural products, standardize the market order of agricultural products, and guide production and consumption in the whole process of agricultural production in order to achieve the best economic, social and ecological benefits.

The principle of simplification is to develop high-yield, high-efficiency and high-quality agriculture, meet the needs of agricultural activities economically and effectively, select and refine the quantity, specifications, quality or other characteristics of agricultural standardization objects, eliminate redundant and inefficient links, refine and determine the efficient links necessary to meet the comprehensive needs of agricultural activities, maintain the refinement and rationalization of the overall composition, and achieve the purpose of saving costs, saving labor, improving quality and increasing efficiency. For example, there are many varieties of cut chrysanthemums. According to the import and export requirements, choose one or several varieties that are most suitable for planting in this area to ensure excellent seed quality. But the standardized object is simplified and will not remain unchanged for a long time. If newer and better varieties are found, the standards should be revised as soon as possible.

The principle of unification is to ensure the necessary order and efficiency of agricultural development, determine the consistent norms applicable in a certain period and under certain conditions for various agricultural activities, the quality, specifications or other characteristics of agricultural products, and make this consistent norm functionally equivalent to the replaced agricultural standardization object. Therefore, the principle of unification includes the unification of agricultural standardization objects and functional equivalence, and unification is relative. Unification is only a means, and the purpose is to obtain maximum benefits.

The principle of coordination is that in order to achieve the best function of agricultural standardization system and produce practical results, it is necessary to coordinate the relationship between related factors inside and outside the system in an effective way, and determine the necessary conditions for establishing and maintaining a consistent, adaptive or balanced relationship. From the microscopic point of view, the principle of coordination is also very important. For example, flower production needs not only a good variety, but also a series of work such as fertilization, seedling raising, pruning and pest control. Then this problem extends to industrialization, as well as packaging, transportation and circulation. As long as one link is unreasonable, it is difficult to be effective and economical. This book focuses on the standardization, seedling raising and cultivation techniques of flower varieties.

The principle of selecting the best among the best is to select, design, combine and adjust the size, shape, color, production cost and other parameters of agricultural standardization objects and their relationships based on the comprehensive achievements of agricultural science, technology and practice under certain restrictions, so as to achieve the most ideal effect goal.