The colorful striations are created due to the fact that the tree doesn't shed all at once. Slowly, over time, different layers fall off, while other exposed areas have already begun aging. This process makes for a spectacular visual, with the rainbow
When I first saw images of rainbow eucalyptus trees (Eucalyptus deglupta) while scrolling through social media one day, I figured they couldn't possibly be legit. The multicolored bark looks like something you might see in a Dr. Seuss book as if the trees have been decorated with a giant paintbrush. But this eye-catching type of tree does actually exist.
Rainbow eucalyptus trees are native to tropical regions such as the Philippines, Indonesia, and Papua New Guinea. And there are a few places in the southernmost parts of the U.S. where you can see them growing.