A method of burying branches and vines of plants in a wet substrate by layering, and cutting them from the mother plant after they take root to form new plants. Also called pressing branches. The layering rate of adult plants is high, but the propagation coefficient is small, which is often used when other methods are difficult to propagate or when large new plants are to be propagated. Layering is a method of artificial vegetative propagation of plants. Different from grafting, the branches remain intact, that is, they are not separated from the parent plant, and some of them are buried in the soil, and then they are disconnected from the parent plant after taking root. It has been applied to mulberries, grapes and so on, and the layering of papaya is also relatively easy.

The layering methods are as follows: ① Common layering. Suitable for plants or tree species with soft branches and vines (Flos Magnoliae, Chimonanthus praecox, etc.). ) There are more flexible branches near the ground. Bend the 1 ~ 2-year-old branches of the mother plant in all directions, cut off the lower part, press them into the into the pit, fix them with hooks, soil up and compact them, expose the branches slightly vertically upward from the ground and insert them into the bracket. (Principle: The nutrients transported by the catheter can no longer be transported at the incision part of the layering part, thus accumulating at the wound and gradually developing into roots. (2) Horizontal stratification. Suitable for tree species with long branches and easy rooting (such as apple dwarf rootstock, vines, etc.). ). Also known as continuous pressure and trenching pressure. Dig a shallow ditch along the branches, cut the branches at appropriate intervals, fix them horizontally in the ditch, remove the downward buds from the branches and fill them with soil. After rooting and sprouting, each seedling is accompanied by a section of mother body under the internode. ③ wavy layering. Lianas (such as grapes) suitable for long branches and vines. Bend branches and vines up and down into waves, bury the ground part in the soil, and cut them into new plants step by step after they take root and protrude from the ground for a certain period of time. (4) Stratification of heaped soil. It is suitable for trees with strong root and neck tillering or clumping (such as magnolia flower, pearl plum, yellow thorn rose, plum, pomegranate and so on). ) cut off the base of the root neck branch, pile it up and bury it, and cut it into new plants after rooting. ⑤ air stratification. Created by China, it is also called China stratification or high pressure. Suitable for tall or inflexible plants, mostly used for precious tree species (camellia, osmanthus, longan, litchi, pistachio and so on. ). Select 1 ~ 3-year-old branches, tie them around for 2 ~ 4 cm, scrape off the cambium or carve them into the wound, and wrap them with plastic sheets, split bamboo tubes, crocks, etc. Tie it tightly and fix it, fill it with moss or fertile soil, water it often to keep it moist, and cut it into new plants after taking root. Plants that can be layered: pomegranate, rose, smile, magnolia, Taiping flower. ......