The ash stump planted in the basin for many years, because the nutrient consumption of the basin soil is too large, the organic matter and trace elements are reduced, the roots gather at the bottom of the basin, covering the basin wall, and it is easy to push the basin soil out of the basin surface. If the soil is not changed and the nutrients in the soil are increased and trace elements are supplemented by fertilization, the stumps can still grow as usual, but the roots grow thick and elongated, and there are more lateral roots. In order to expose the treated roots, achieve the wonderful posture of intertwined roots and exposed claws, and promote the development of root physiological functions, it is necessary to turn over pots and change soil. As the saying goes, "Potted trees have no roots like inserting trees", and roots are an important part of ash stump bonsai. Bonsai without roots is not a complete ash stump bonsai, nor is it a perfect ash stump bonsai without beautiful roots. Only when the new pile is planted for more than three years and grows well can it be turned over. Two years of pile cultivation has just regained vitality, and it is easy to affect the tree potential prematurely. The time of turning pots and roots should be from before and after germination to early summer, and the best time is before and after germination. At this time, the branches and leaves are still cold in spring, and the underground fine roots have been advanced, while the spring is a period of vigorous plant growth. After the root system is flattened, there are three growth seasons, which is very beneficial to the rejuvenation and growth of the root system. When changing pots, when the soil is wet, hold the pot with one hand and the pile with the other, turn the pot over, slightly shake or press the bottom hole, and fasten the soil and the stump together. Stump and soil in a bulging pot are difficult to buckle. You can remove part of the topsoil, wash the edge of the pot with tap water, and then pull out the stump smoothly after making a certain gap around it. Less water damage, safety and convenience. Rinse the exposed stump with water, remove part or all of the soil, expose the root system, and dry for one hour. When the root of a tooth changes from brittle to soft, it is best to adjust the setting with a wire with appropriate thickness, such as rope. When adjusting, grasp the focus, apply force slowly, and protect the sharp bend with your fingers. Wrap a dense wire around the fragile part to prevent it from breaking and cracking. When bending, bend to the required angle until no rebound deformation occurs. Thick roots cannot be bent in place at one time, and other square farads can be used to reach the position several times. The method of hanging roots and exposing claws can be used for modeling, and the scattered roots can be properly gathered for modeling, so that the roots can form a strong sense of support. The method of staggered flat roots can be used to make the roots cross each other, and then lie flat on the soil surface and plunge into the soil. You can also use the method of lifting the roots and claws to lift the roots off the ground and bend them into the soil after turning. Many roots can also radiate in all directions, or lay stones under the roots and roll on them to form new attached stone varieties. There are many kinds of roots and great changes. According to different tree species, combined with their own understanding and creation, make their own unique modeling methods, form their own style, so as to show their own beauty. As long as you work hard at the roots, you will be able to produce good works at the roots. After the roots are leveled, dry the fine soil with the prepared sieve and put it into the basin. Dry fine soil has good fluidity and vibrates while filling the soil, which can make the soil fully flow into the gap of the root and closely contact with the root. Don't use wet soil, which has poor fluidity and can't fill the small gaps in the roots. When the soil is filled to three quarters, shake the basin again, tie the gap of the soil with a blunt bamboo stick, and add water or soak it. After water permeates, the basin body will be vibrated or the soil will be tamped, and the basin soil will be filled for normal maintenance and management. During curing, the roots need to be thinned. The method is to put the stump in a sunny place, which is beneficial to the full photosynthesis of plants and promotes their absorption and evaporation of water. Don't water the pot soil immediately when it is dry. Water it after half a day or eight hours. This repeated alternation, supplemented by thin application and diligent application, can achieve the purpose of thinning the root system. The root system is thick, numerous and long, which fills the basin bottom and even pushes the soil out of the basin surface. More roots, vigorous branches and leaves, can withstand wind and rain, sun and rain. After several years of cultivation and exposure, the root bonsai has repeatedly taken root, and its beauty is self-evident.