Rainbow Eucalyptus Tree: Care & Growing Guide

 Botanical NameEucalyptus deglupta
Common NameRainbow eucalyptus, rainbow gum, Mindanao gum
 FamilyMyrtaceae
 Plant TypeTree
 Mature SizeUp to 100 ft. tall, 60 – 100 ft. wide
 Sun ExposureFull sun
 Soil TypeMoist but well-drained
 Soil pHAcid, Neutral
 Bloom TimeVaries
 Flower ColorWhite
Hardiness Zones10-11, USA
 Native AreaMalesia and Papuasia

Rainbow Eucalyptus Trees Care

Transplanting these trees is not a good idea—they aren’t fans of root disturbance. If you want to start seeds indoors, you’ll want to grow your rainbow eucalyptus in a large container that can be easily transplanted outside. You’ll want to select a warm, sheltered site as these trees don’t like cold, drying winds.

Because of their fast growth rate and size, choose a site that is far enough away from structures, foundations, power lines, and drainage systems as the sprawling roots could cause problems.

The Spruce / Heidi Kolsky

The Spruce / Heidi Kolsky

The Spruce / Heidi Kolsky

Light

Rainbow eucalyptus trees need plenty of sun, so plant in a position with access to unfiltered light.

Soil

This species thrives in deep sandy, loamy soils that are fertile, moist, and well-drained. It doesn’t appreciate high alkalinity in the soil, fairing better with neutral to slightly acidic pH levels.

Water

Although established rainbow eucalyptus trees can tolerate some drought, they need regular watering during their first year. The trees can’t handle prolonged flooding or waterlogged conditions, but keeping them moist will encourage the trunk and the bark to swell, encouraging more defined color stripes. Mulching around the tree can help conserve moisture, but make sure you don’t place the mulch up against the trunk.

Temperature and Humidity

These trees grow best in temperatures of around 70 to 85 degrees Fahrenheit and appreciate high humidity levels. Unsurprisingly, rainbow eucalyptus trees are not tolerant of frosts. Temperature, humidity, and airflow all have a considerable influence on how distinct the coloration of the tannins in the tree bark will be.

Fertilizer

Unless you plant your rainbow eucalyptus tree in highly infertile soil, it shouldn’t need feeding. They aren’t fans of phosphorus—plus, without fertilizer, you can slow down their infamously fast growth rate.

Pruning

Your established rainbow eucalyptus tree won’t need a lot of pruning unless you want to shape it, manage its height, or maintain a strong leader. The leader becomes less dominant as the tree ages and the branches start to curve up at the ends so that a flat, spreading crown develops. Removing any branches suffering from damage or disease can be done in late winter or early spring.

Propagating Rainbow Eucalyptus Trees

Rainbow eucalyptus trees can be propagated only from very young trees. A study showed that cuttings taken from seedlings and trees younger than five years rooted well, but cuttings taken from older trees failed to root due to a chemical that inhibits rooting within the older specimen. Propagating in a humid, warm environment produces fast results, especially when dipped in a rooting hormone and selecting a stem node with a leaf segment.

How to Grow Rainbow Eucalyptus Trees From Seed

With the right conditions, this species also propagates easily from seed. Follow these tips for a higher success rate:

  1. Make sure that temperatures around 90 degrees Fahrenheit are optimal for germination.
  2. Surface sow the seeds in a sunny position with moist soil.
  3. Keep the soil moist and wait for germination to occur, usually within 1-3 weeks.
  4. Plant seedlings outside when they are around 12 to 15 months old.

Common Pests & Plant Diseases

Rainbow eucalyptus trees are relatively hardy and not prone to leaf spot disease, which is common in humid, warm environments. Their peeling bark also helps them get rid of certain parasites. However, they can suffer from root rot in waterlogged conditions and are susceptible to the root fungus Armillaria. Beetle borers and termites have also been known to attack this hardwood tree.

FAQ

  • Your tree could grow as much as three to five feet every year. The fastest rate of growth is during the first decade. In their native habitat, this species can reach heights of 200 feet or more, and, in gardens, they can still grow up 100 feet tall, depending on the conditions. Because of their height and growth rate, rainbow eucalyptus trees are best for large garden landscapes where they have ample space.

  • As well as being tall, these trees are also long-lived. Depending on the conditions, your rainbow eucalyptus tree could live anywhere from around 50 to 150 years.

  • Rainbow eucalyptus trees are too large to grow indoors and belong outside.

Disclaimer: Curated and re-published here. We do not claim anything as we translated and re-published using google translator. All images and Tattoo Design ideas shared only for information purpose.

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