If you’ve ever seen a tree with its lower trunk painted white, it’s not just for decoration. This practice, common among gardeners and orchard owners, serves an important protective purpose. During winter, rapid temperature changes—from cold nights to sunny days—can cause the bark to crack, a condition called sunscald.

Applying a light-colored coating to the trunk reflects sunlight, preventing the wood from overheating and helping reduce the risk of splits and damage. This method is especially common for young trees, slender residential trees, or fruit trees in orchards. Gardeners usually use water-based latex paint for this purpose.

Many dilute the paint with water, often mixing equal parts paint and water for the right consistency. Some even add joint compound, which not only provides extra protection against harsh weather but can also help deter boring insects. The paint is typically applied with a brush rather than sprayed, ensuring full coverage and long-lasting protection. Most gardeners make this an annual task, much like putting a coat on a tree to face winter.

While trees may sometimes be marked with colored dots to convey other information—like orange for trees set to be removed or purple for boundaries—the white paint is purely protective. It’s a practical technique rather than an aesthetic choice, reflecting the care and attention of dedicated tree enthusiasts.

In short, a white-painted trunk is a sign of careful stewardship. By giving trees this protective coating, gardeners help ensure their health, resilience, and longevity, allowing these leafy giants to thrive for many years.