Why do trees draw broken limbs?

Sometimes the "paint" painted on trees is limewater with salt or sulfur mixture, which is used to eliminate overwintering pests in bark and prevent pests from laying eggs on trees, and has the functions of antifreeze, heat preservation and insect prevention. Coloring the seedlings can also protect them from winter and improve their survival rate.

Some are a "big tree callus coating agent", for example, in the pruning place of branches or the injured place of trunk (hit by a car or something). It is a paint-like reagent, which not only helps the pruning mouth of big trees to heal as soon as possible, but also has the functions of sterilization and antisepsis, reducing saliva content and nutrient loss during pruning.

Poplar trees on the roadside are often colored, mainly to prevent pests and diseases.