How the Rainbow Eucalyptus Gets Its Painted Look
The rainbow eucalyptus (Eucalyptus deglupta) does not grow bark in separate colored layers. Its trunk becomes a shifting mosaic because bark peels away in narrow strips at different times, exposing fresh surfaces while older ones remain beside them.
Newly exposed bark is bright green. As it is exposed to air and ages, its color changes through blue and purple tones toward orange and maroon. The exact chemistry behind every shade is not fully settled, but the progression is tied to changes in the bark’s surface and pigments as it matures. Because different patches are at different stages, the trunk can display several colors at once.
A Tropical Tree With a Different Rhythm
Unlike many familiar trees that develop thick, persistent outer bark, this species sheds it regularly. The shedding helps reveal the smooth, colorful trunk, though it also means the vivid pattern is temporary: a patch will darken, peel, and give way to fresh green underneath.
Native to the humid tropics of the Philippines, Indonesia, and Papua New Guinea, the tree is also planted elsewhere in warm climates as an ornamental. Its appearance is not a fixed pattern painted onto the trunk; it is a snapshot of ongoing renewal. Look at the same tree later, and the colors may have shifted as new strips emerge and old ones age.
