The propagation of rubber trees is mainly cuttage, which can be carried out in May-September, usually in May-June. Combined with pruning and shaping, remove the leaves at the lower part of the cut branches (it is better to have an aging part at the lower part, which is easy to take root), leaving only the top 1 leaf or half leaf, put it in the shade to dry slightly, and cut it into sterile river sand or vermiculite. Water spraying can be stopped or reduced about 3 weeks after transplanting, and the light is gradually strengthened. You may not be able to produce new leaves after taking root, so you need to try it by hand. If the roots are born, they can be transplanted into the culture soil. The survival rate of transplanting is the highest when the root length is 3-5 cm.