Many people notice trees with white paint on their trunks and assume it is decorative, but the real purpose is practical. Tree caretakers use this method to protect young trees from winter stress and sudden temperature changes. While the paint may seem simple, it plays an important role in helping the tree stay healthy during the coldest months.
Other tree markings can have completely different meanings. Orange dots may indicate a tree scheduled for removal, while purple markings often signal property boundaries or “no trespassing” areas. White paint, however, is used for protection rather than communication. Its main purpose is to help prevent sunscald, a winter condition where bark expands during warmer daytime temperatures and quickly contracts at night, causing cracks that leave the trunk vulnerable.
To shield the bark, caretakers apply white paint because it reflects sunlight and helps prevent the trunk from overheating. This keeps the surface temperature more stable and reduces the chance of cracking. The paint used is usually water-based latex, mixed with an equal amount of water to ensure it goes on evenly. It is typically applied with a brush, though orchards and large plantings may use sprayers to cover many trees efficiently.
Most trees only need to be painted once each year to remain protected through winter and early spring. This simple step can make a significant difference in their long-term health and resilience. The next time you see a tree with a white trunk, you’ll know it’s not just for appearance—it’s a thoughtful and effective method to help trees withstand harsh weather and grow strong in the seasons ahead.