Why Are Tree Trunks Painted White?

Believe it or not, arborists and tree maintenance specialists alike use paint on trees for a number of reasons. In some cases, it’s to signal that a specific tree is about to be cut down. In other instances, it’s to warn trespassers that they’re on private property. But why are tree trunks painted white? This is typically done to prevent a condition called sunscald and to prepare the tree for a change in seasons. Keep reading to learn more about the procedure and how (and if) to do the same for your trees. 

Why Tree Trunks are Painted White

You asked, now here’s your answer: Tree trunks are often painted white to prevent sunscald, which is a condition where extreme fluctuations in temperature cause bark to split. The white paint prevents the wood from overheating and keeps splits or cracks from impacting the tree’s health. White paint is most commonly used on thin residential trees or species in orchards, and you’re most likely to see it in climates that go from extreme cold to extreme heat.

Types of Trees That Benefit from White Trunks 

Not all trees require white paint to prevent splits and cracks in the bark. The following types of trees benefit the most from white-painted trunks, as they’re more susceptible to sunscald:

• Fruit trees 

• Birch trees 

• Pecan trees 

• Citrus trees 

• Maple trees

How to Paint Your Tree Trunk White

Whether you’re a beginning or experienced DIYer, the good news is you can tackle this project yourself if your trees are at risk of sunscald. You’ll just need to use water-based latex paint in order for it to adhere to a more rough texture. Once a year, take a paintbrush and apply the white paint to the trunk of your tree or trees before the heat of the summer hits. If you’d rather leave this task to the pros, you can consult your local tree maintenance professional to provide a quote. 

Regions Most Affected by Sunscald 

You may not have to worry about the effects of sunscald if you live in an area where the temperatures don’t fluctuate in a major way. However, the U.S. regions mentioned below can be more susceptible to the condition, so it might be wise to keep your white paint handy. 

Western Region 

High-elevation regions, which include parts of Colorado and California, are at risk of sunscald since temperature variations between day and night are significant.

Southern Region 

The extreme heat in states such as Texas and Florida can cause stress on tree bark, especially if the trees are exposed to the sun for several hours during the day. 

Midwest Region

In areas like Illinois, Indiana, and Ohio, winters can be harsh and spring temperatures can fluctuate rapidly, which makes trees more at risk of sunscald.