If you’ve noticed trees with white paint around the base of their trunks, it’s not for looks—it serves a practical purpose used by gardeners and orchard owners.

In colder seasons, trees can be stressed by sharp temperature swings between chilly nights and warm, sunny days. This can lead to bark damage known as sunscald. A white coating helps reflect sunlight, keeping the trunk from overheating and reducing the risk of cracking.

This technique is especially helpful for younger and fruit-bearing trees, which tend to have thinner, more sensitive bark. Many people use diluted water-based latex paint, sometimes mixed with additional protective ingredients, and apply it by hand for even coverage.

Typically, this treatment is done once a year as part of regular tree maintenance.

It’s also worth noting that different paint colors on trees can mean different things. While white usually signals protection, other colors—like orange or purple—may indicate property lines or trees marked for removal.

Overall, a white-painted trunk is a simple but effective way to protect trees and keep them healthy through changing weather conditions.