White-painted tree trunks are not usually decorative—they are often protected against **sunscald**, a type of winter bark injury caused by rapid temperature changes.
Sunlight can warm the bark during the day while nighttime temperatures cause it to freeze and contract, leading to cracks and damage.
A diluted white coating can reflect sunlight and reduce these temperature swings, helping protect especially young or vulnerable trees.
So, those rows of white trunks are often a simple, practical method of helping trees survive harsh winter conditions.
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