Many people think the white paint on tree trunks is decorative, but it actually has a purpose. As the article notes, “The white coating is used by tree caretakers to protect trees from specific types of damage, especially during winter months.”

Not all tree markings mean the same thing. Orange spots usually show which trees are planned for removal, while “purple paint… is widely used to show property boundaries or areas where trespassing is not allowed.” White paint, however, is not about ownership or cutting.

Its main role is protecting trees from winter injury called sunscald. This happens when the bark warms up in sunlight and then cools quickly at night. The article explains that “this sudden temperature shift makes the bark expand and contract quickly, causing cracks that weaken the tree.” These cracks can later let in pests and diseases.

To prevent this, caretakers brush on diluted white latex paint. The light color reflects sunlight, helping the trunk stay at a stable temperature during cold months and lowering the risk of damage. According to the article, the paint is applied as “a thin layer of diluted white latex paint,” usually mixed half paint and half water.

This coating is refreshed once a year and doesn’t harm the tree. When you see a white-painted trunk, it simply means someone is taking steps to protect it through harsh winter conditions—an easy and effective method to keep trees healthy.