You may have noticed trees with their lower trunks painted white and wondered why. It’s not just for looks or marking land—it actually helps protect the tree.
Trees can suffer from “sunscald,” a type of damage caused when sunlight warms the bark during the day and cold temperatures cool it off quickly at night. This sudden temperature change causes the bark to split, which can make trees more likely to get sick or attacked by pests.
Applying white paint on the trunk reflects sunlight and keeps the bark temperature more stable. This stops the bark from expanding and cracking in winter. Farmers use this method a lot in orchards because tree health affects fruit production.
White paint works well because it’s highly reflective. It prevents overheating and also protects trees from harmful insects and fungi. The paint used is often a water-based latex diluted with water to keep it safe for the tree.
This idea of whitewashing trees is a long-standing tradition. Though it might look odd to city dwellers, it’s a trusted way to help trees survive the changing environment. With more open spaces and less shade in developed areas, trees face stronger sun exposure and need this extra protection.
Trees are essential for shade, air quality, and food, so taking care of them with simple methods like this makes a big difference. When you see white-painted trees, you’re looking at a sign of thoughtful care and an effort to keep nature healthy.
