What is Rainbow Eucalyptus?

Rainbow Eucalyptus, also known as Eucalyptus deglupta, is a tall tree species native to the Philippines, Indonesia, and Papua New Guinea.

Incredibly colorful bark: Rainbow Eucalyptus is known for its unique and strikingly colorful bark, which peels away to reveal bright green, blue, purple, orange, and maroon stripes.

Habit: This is a fast-growing, evergreen tree that can reach heights of up to 200 feet (60 meters) in its native habitat but will grow up to 100 feet (30 meters) elsewhere. The tree can add 3-5 ft. (90-150 cm) per year. Young trees have a conical crown with a leader and almost horizontal branches. As the tree matures, the branches curve up, and the leader becomes less prominent - hence forming a spreading, flat-topped crown. 

Leaves: The foliage of lance-shaped leaves, up to 6 inches (15 cm) long, is aromatic when crushed.

Flowers: Umbels of small white flowers bloom at various times during the year, depending on location.

Uses: Rainbow Eucalyptus is a major plantation tree for pulp production. It is also widely planted as an ornamental tree because of its attractive bark. Excellent shade tree that requires ample growing space.

Hardiness: It is hardy in USDA zones 10 to 11 and prefers well-drained soil and full sun.

Deer: Deer tend to avoid eucalyptus shrubs and trees, making them a good choice for landscapes in areas with high deer populations.

Why should I Grow a Rainbow Eucalyptus Tree?

Growing a Rainbow Eucalyptus can add a unique and colorful addition to your landscape. Its stunning multicolored bark and fast growth rate make it a popular choice for tropical and subtropical climates.

Where to Plant a Rainbow Eucalyptus?

The Rainbow Eucalyptus tree can be grown in areas with tropical or subtropical climates. Here are some tips on how to grow it:

Climate: It grows best in areas with a warm, humid climate. It can be grown in USDA Hardiness Zones 10 and 11.

Sunlight: The tree requires full sun to grow properly. It can tolerate partial shade, which may affect its growth and coloration.

Soil: It prefers fertile, consistently moist, well-draining soil that is slightly acidic. It can tolerate a range of soil types but prefer loamy soil.

Water: The tree needs regular watering, especially during the first few years of growth. It can tolerate short periods of drought, but extended periods of dryness can be detrimental.

When to Plant a Rainbow Eucalyptus?

Rainbow Eucalyptus can be planted outdoors in the spring or fall as long as the temperatures are above 50°F (10°C). The ideal temperature range for growing it is between 65-85°F (18-29°C). It is important to avoid frost and freezing temperatures as they can harm the tree.

If you are planting in a container, it can be done any time of the year. It is important to choose well-draining soil and to keep the tree adequately watered during the first few months after planting.

How to Plant a Rainbow Eucalyptus Tree?

Choose a sunny location: This eucalyptus requires full sun to grow properly. Choose a location that receives at least 6 hours of direct sunlight per day.

Prepare the soil: Rainbow Eucalyptus prefers rich, well-draining soil. Amend the soil with organic matter, such as compost or aged manure, to improve drainage and fertility.

Dig a hole: Dig a hole that is as deep as the root ball and twice as wide. Gently loosen the roots of the plant before planting.

Plant the Rainbow Eucalyptus: Place the plant in the hole and backfill with soil, tamping it down gently to remove any air pockets. Water the plant thoroughly.

Mulch: Add a layer of organic mulch, such as shredded bark or leaves, around the base of the plant to help retain moisture and suppress weeds.

Remember: Rainbow Eucalyptus can grow quite large and should only be planted in areas with plenty of space for the tree to mature. 

Rainbow Eucalyptus Care

Rainbow Eucalyptus requires a relatively low-maintenance care regimen, making it a great addition to any landscape.

Water: This tree requires consistent moisture. It should be watered regularly as it is highly susceptible to drought. Water the trees 2-3 times a week to keep the soil moist.

Fertilizer: Rainbow Eucalyptus generally does not need a lot of fertilizer, as they are able to extract nutrients from the soil quite efficiently. However, if you feel that your tree is not growing as vigorously as you would like or your soil is infertile, you may apply a slow-release fertilizer. Avoid over-fertilizing, as this can lead to excessive growth and weak branches.

Pruning: Pruning is not typically necessary for Rainbow Eucalyptus except to remove dead or damaged branches.

Protection from Cold: Rainbow Eucalyptus is not cold-hardy, and young trees should be protected from freezing temperatures by wrapping them in burlap or covering them with blankets during winter.

How to Propagate

The best propagation method for Rainbow Eucalyptus is through seeds, which have a high germination rate and are relatively easy to grow. However, Rainbow Eucalyptus can also be propagated through cuttings and grafting, although these methods are more challenging and require specialized techniques and equipment.

Propagation through Seed:

• Fill a seed-raising tray with a mix of sand and peat moss.
• Plant the seeds about 1/4 inch deep in the soil mix.
• Water the seeds well and place the tray in a warm, well-lit area. The ideal temperature range for germinating is between 70-85°F (21-29°C). However, some sources suggest that temperatures closer to 85°F (29°C) may provide the best results for germination.
• Keep the soil mix moist but not waterlogged.
• After 1-2 weeks, the seeds will begin to germinate.
• Transplant the seedlings into individual pots once they have developed their second set of leaves.

Pests and Diseases

Rainbow Eucalyptus is relatively resistant to pests and diseases. However, it can be affected by some common eucalyptus pests and diseases, such as:

Psyllids: These insects can cause leaf deformation and stunted growth. Regular spraying with insecticidal soap or horticultural oil can help control them.

Eucalyptus gall wasp: This pest can cause damage to the tree's growth tips, leading to stunted growth and deformation. Pruning affected growth tips and destroying the pruned tips can help control the infestation.

Leaf spot: This fungal disease can cause brown spots on the leaves and defoliation. Regular pruning to improve air circulation and the application of fungicides can help control the disease.

Root rot: This disease can cause wilting, yellowing, and eventual death of the tree. It is caused by waterlogged soil and poor drainage. Planting the tree in well-draining soil and avoiding overwatering can prevent root rot.

Regular inspection and prompt treatment of any pest or disease infestation can help maintain the health and vigor of the Rainbow Eucalyptus tree.

Frequently Asked Questions

Can I grow a rainbow eucalyptus?

You can grow this wonderful tree if you live in a warm and humid climate, such as the tropics or subtropics. It is fast-growing and can reach up to 200 feet (60 meters) in its natural habitat but will grow up to 100 feet (30 meters) elsewhere. It requires well-draining soil and plenty of water.

Is the rainbow eucalyptus rare?

While native to Indonesia, Papua New Guinea, and the Philippines, this tree has been introduced and cultivated in other parts of the world, such as the United States, where it is grown for ornamental purposes. While it may not be as common as other eucalyptus species, it can still be found in certain regions where it has been planted or naturalized.

Are Rainbow eucalyptus trees hard to grow?

Rainbow eucalyptus trees can be challenging to grow in some regions as they require warm temperatures, high humidity, and consistent moisture. However, they can be grown successfully in tropical and subtropical areas that meet these conditions. Additionally, the trees require plenty of space to grow