The method of turning over pots and changing soil is as follows:
1. Remove the pot and cut the soil. When the soil in the basin is not dry or wet, turn the basin upside down, pat the bottom of the basin, and push the tile at the bottom of the drainage hole with your thumb to take out the tree and soil in the basin. Then use bamboo chips to cut off about half of the old soil around. But the amount of soil cut also depends on the tree species. For tree species with many fibrous roots and easy survival, such as rhododendron and boxwood, you can cut off a little old soil.
2. Cut the roots. Cut off the rotten roots and some old roots with scissors. The amount of root cutting depends on the development of root system. If the root system is underdeveloped, the new roots are underdeveloped, and the fibrous roots at the bottom of the soil block are not densely distributed, it is necessary to cut less or not; If the root system is developed and the fibrous roots are dense at the bottom of the clod, not only the old roots should be cut off, but also the fibrous roots should be trimmed. Some tree species, such as Pinus thunbergii and Pinus bungeana, have stronger taproots than lateral roots, and layers of long roots cover the basin. These long roots should be cut off to promote lateral root germination. However, boxwood and bamboo with developed lateral roots should all be cut off to control the growth of whiskers.
3. Use the "deep pot shallow planting method" after turning the pot (if the pot is shallow, this method can shorten the recovery period).