When the plant is too high, it can be shortened according to the required height. When the branchlets on the formed plants are too long or the leaves are aging, the old stems can be cut short, and the top can be sealed with wax or paint to maintain high temperature and humidity, so that new branches and leaves can be born under the incision. If the pile at the bottom is rotten, the rotten part can be sawed off, soaked in 0.2% potassium permanganate water 10 ~ 30 minutes, and buried in well-drained matrix soil for replanting.