Vegetative propagation is the propagation by using the regeneration function of plant vegetative organs (such as roots, stems, leaves, etc.). ). Branching, layering, cutting and grafting are commonly used to make it grow into independent new plants. The advantages of asexual reproduction are: it can maintain the excellent characters and characteristics of the original variety; Affected by stage development, flowering and fruiting are earlier than sowing and reproduction; It is especially suitable for the propagation of sterile horticultural varieties. The disadvantages are: the root system of seedlings is shallow and there is no main root; Long-term vegetative reproduction often reduces vitality; Asexual propagation seedlings have a short life span. Plant division: A plant is divided into several plants by using the characteristics of clustered plants or tillers, stolons and rhizomes. Most ramets are dormant or combined with pot changing. The new ramet has its own roots, stems and leaves, so it is very easy to survive after transplantation. The disadvantage is that the propagation coefficient is low and a large number of seedlings can not be obtained at one time.