What is the layering of bonsai?

Layering propagation refers to burying plant branches in human soil, using the nutrition of the mother to germinate new roots, and then separating them from the mother to become new plants. It is characterized by promoting its branches to take root without leaving the mother plant, which is easy to survive, but the number of reproduction is small. Layering methods include common layering method, heaped soil layering method, high altitude layering method, recumbent layering method, etc. , according to different patterns.