So why white? The answer lies in physics and biology. During winter, especially in regions with fluctuating temperatures, trees face a dangerous phenomenon called sunscald. During the day, the sun warms the bark, sometimes dramatically, while nights can drop to freezing or below. This rapid heating and cooling causes the outer bark to expand and contract repeatedly, which can crack or split it—a serious injury that leaves the tree vulnerable to diseases, insects, and even death.
White paint works because it reflects sunlight, rather than absorbing it like darker bark would. By reflecting much of the sun’s energy, the paint helps the trunk maintain a more consistent temperature throughout the day, reducing the stress caused by rapid temperature swings. This simple, low-tech solution can prevent major damage to the tree during the cold mon
