Have you ever walked past trees with their trunks painted white and wondered why? I used to think it was just for looks or maybe even part of a trail marker — but it turns out, there’s a much more important reason behind this unusual sight.
After a little digging, I found out that tree caretakers and landscapers use white paint not as decoration, but as a smart protective measure — especially during the winter months.
While different paint colors on trees can carry various meanings — like orange dots signaling a tree will be removed or purple markings indicating private property — the white paint tells a completely different story.
So what does it mean when a tree’s trunk is painted white? It’s actually a way to protect the tree from an unexpected winter hazard: sunscald.
In the colder months, trees are especially vulnerable to rapid temperature changes. When the winter sun hits the bark during the day, it warms up and begins to expand slightly. But once the sun sets and the temperature drops fast, the bark contracts quickly. These sudden changes can lead to splitting or cracking in the tree’s outer layer — damage that can seriously affect its long-term health.
That’s where the white paint comes in. Because it reflects sunlight, it keeps the tree’s bark cooler and prevents it from heating up too much during the day. This helps reduce the stress caused by extreme temperature swings — acting almost like a form of sunscreen for the tree.
Curious about how the paint is applied? It’s not just any paint — most gardeners and arborists use a watered-down latex paint. The usual recipe is one gallon of water to one gallon of white latex paint. This thinner mixture helps the bark breathe while still offering protection. The paint is either brushed on or sprayed evenly to cover the entire lower trunk.
And how often do they do it? Generally, just once a year, typically before the coldest part of winter begins.
It’s amazing how something as simple as a coat of paint can help a tree survive harsh conditions and continue growing strong. The next time you see a row of trees with white trunks, you’ll know they’ve been given a little extra care to make it through the season safely.
Have you ever noticed trees like this in your area? Share your thoughts in the comments — we’d love to hear from you!
