Eucalyptus deglupta aka Deglupta

Eucalyptus deglupta has two common names: rainbow eucalyptus and Mindanao gum. It belongs to the myrtle family, Myrtaceae. Its native lands span the Philippines, Indonesia and New Guinea. It grows in warm, wet forests with high rainfall. Trees form dense stands by rivers and on fresh banks. They also grow where landslides or volcanic eruptions clear land.

This tree grows fast, stays green, and becomes very large. Grown outside its native range, it reaches 100–125 feet [30.5–38.1 metres]. Wild trees can reach 250 feet [76.2 metres]. The trunk forms a long, clear stem below the crown. Some trees form broad supports, called buttresses, at the base. Its smooth bark has an orange tint and peels in summer. As it peels, it shows patches of several colours below. These changes in the bark give the tree its rainbow name. Its broad leaves have a scent and stay green all year.

The tree bears white flowers, which add interest when it blooms. The Missouri Botanical Garden says it blooms by season, without fixed months. Bees and other insects visit the flowers and pollinate them. The tree also forms seed capsules, which hold its seeds. Growers can raise new trees from seed in a sunny spot. Keep the seed compost moist while the seeds sprout. Growers can also raise plants from cuttings of young branches. These must come from trees less than two years old.

Plant this tree in full sun and rich soil. It needs soil that stays moist to wet. Its wet forest roots suit warm sites with ample water. The Missouri Botanical Garden lists USDA zones 10–11 for growth outdoors. Frost can harm it, so it needs a frost-free climate. The same source says the tree needs little upkeep. It reports no major insect pests or disease problems.

This huge tree suits large grounds where winters stay warm. In Hawaii, people plant it along streets and for shade. The trunk adds colour even when the tree has no flowers. Growers also plant it across the wet tropics for wood. The wood has fair strength but does not resist decay well. Woodworkers make furniture and other goods from it. Useful Tropical Plants lists no known food or health uses. The leaves have too little essential oil to produce for sale.