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Blocking the Sun
The sun’s UV rays are hazardous to palm trees as they burn their bark and damage the cambium layers. Eventually, due to dehydration, these palm trees will die. And while adult palm trees can protect themselves from UV rays, it takes about three years before they can fully develop their bark. Thus, whitewashing is used to offer enough protection until palm trees are mature and don’t need help anymore.
Improving Visibility
Last but not least, the bark of palm trees is painted white to make them more visible, specifically for those on the side of the road. Why is that important? Because accidents involving palm trees are extremely common, especially in California. And though painting palm trees won’t stop accidents, it will make them less frequent, as drivers can see them much more clearly, even during the night.