Stump bonsai should be in Pinza to avoid cold winter. In the land of Zhongguang, except for some areas in Lingnan, most tree species in most areas are in an obvious dormant period. Even though some evergreen tree species, such as conifers, boxwood and snow, do not wither in winter, their physiological mechanisms are still dormant or semi-dormant. These dormant or semi-dormant branches are very fragile at cold temperatures. If you tie it at this time, it will be broken if you are not careful. Even if it is not broken, as long as it hurts a little bit, it will die from the wound when it germinates in spring, and the branches will fall off. As long as you have a little experience in pile cultivation, you won't miss this. After spending the winter in the vast North China, we should pay more attention and don't start tying at will, so as not to cause irreparable losses.