🌳 Almost No One Knows Why Tree Trunks Turn White

Have you ever noticed tree trunks painted white at the bottom and wondered why? It’s a common sight in parks, gardens, and along roadsides — yet few people know the real reason behind this curious practice.

It’s not just for decoration! The white paint on tree trunks serves several important protective and ecological purposes that help trees stay healthy and strong year-round.

Let’s explore why this simple yet effective technique is so widely used — and why you might consider doing it in your own garden.

🌞 1. Protection from Sunburn (Yes, Trees Can Get Sunburned!)

During winter or early spring, when the sun is strong but the air is cold, the bark of a tree can experience sudden temperature changes.
This can cause sunscald — cracks or splits in the bark due to rapid heating and cooling.

The white color reflects sunlight, preventing the bark from overheating during the day and cooling too quickly at night.
Just like sunscreen for humans, this coating acts as a thermal shield, protecting young or thin-barked trees like apple, citrus, and birch.