How to raise roots in lobular rosewood bonsai

Roots are an important part of stump bonsai, and the distribution and shape of roots directly affect the ornamental value of bonsai. Cultivate the roots of stumps in a planned way, and turn over pots, change soil and change pots every year. In this process, the roots are arranged, the extension direction of the roots is mastered, and then the roots are continuously planted, and the roots gradually emerge from the ground. Create an environment where roots can be shaped, such as a tall tube environment. The soil in the test tube should be breathable. You can choose coarse sand as soil, and pay attention to the use of large-particle perlite, vermiculite and small-particle orchid stone, which is very breathable.