Corymbia Citriodora | Lemon-scented Gum | An Aromatic Australian Botanical Specimen

A eucalyptus grown not only for its appearance, but also for its fragrance

Corymbia citriodora (formerly known as Eucalyptus citriodora) is one of the most distinctive aromatic eucalyptus species available to plant collectors. Commonly called Lemon-scented Gum or Lemon Eucalyptus, it is admired for its elegant silver-green foliage, smooth pale bark and unmistakable fresh lemon fragrance released when the leaves are touched.

Unlike many ornamental foliage plants that appeal mainly through colour or flowers, Corymbia citriodora creates a multi-sensory experience. Its beauty lies in the combination of graceful growth, botanical history and aromatic chemistry. It is especially appreciated by collectors of unusual foliage plants, Mediterranean-style plants and Australian botanical specimens.

Botanical Background

Corymbia citriodora belongs to the family Myrtaceae, which includes other aromatic plants such as myrtle, tea tree (Melaleuca) and guava (Psidium).

For many years this species was classified as Eucalyptus citriodora, and this name is still widely used in horticulture and plant trade. Modern botanical research has placed it in the genus Corymbia, separating it from the true eucalyptus genus.

The species originates from eastern Australia, particularly Queensland and northern New South Wales, where it naturally grows in open woodland and dry forest habitats.

In its native environment, it experiences:

• intense sunlight
• seasonal rainfall
• periods of drought
• nutrient-poor, well-drained soils

These conditions shaped the plant's remarkable adaptations.

Ecological Adaptations

The characteristic lemon fragrance comes from essential oils stored within specialised leaf structures. These oils contain high levels of citronellal, a volatile compound responsible for the fresh citrus scent.

From the plant's perspective, these aromatic compounds are not produced for human enjoyment. They form part of a chemical defence system that helps discourage herbivores and certain insects.

The narrow adult leaves also represent an adaptation to dry climates. Their vertical orientation reduces direct exposure to intense midday sunlight, helping to limit water loss.

Why This Plant Stands Out

• Distinctive natural lemon fragrance from the foliage.
• Elegant silver-green leaves with changing juvenile and adult forms.
• Attractive smooth white-grey bark.
• Fast-growing Australian tree with strong architectural character.
• Fascinating example of plant adaptation to drought conditions.
• Suitable as a container-grown specimen when young.
• Excellent plant for collectors interested in fragrance and botanical diversity.
• Organically cultivated at TOMs FLOWer CLUB with focus on healthy development.

Plant Characteristics

Botanical name:
Corymbia citriodora (formerly Eucalyptus citriodora)

Common names:
Lemon-scented Gum, Lemon Eucalyptus

Plant family:
Myrtaceae

Origin:
Eastern Australia (Queensland and northern New South Wales)

Plant type:
Evergreen aromatic tree

Growth habit:
Upright, elegant tree with smooth trunk and branching structure

Growth rate:
Fast-growing under suitable conditions

Mature size:
In nature, approximately 25–40 metres; considerably smaller when maintained in containers

Leaves:
Juvenile leaves are rounded and often bluish-green; mature leaves become narrow, elongated and grey-green

Flowers:
Creamy-white flowers rich in nectar

Flowering season:
Variable depending on climate and cultivation conditions

Fragrance:
Strong fresh lemon aroma when leaves are touched or warmed by sunlight

Special characteristics:
Aromatic foliage, decorative bark, Australian botanical character

Collector value:
Highly appreciated for its fragrance, foliage transition, architectural growth and unusual sensory qualities

Suitable location:
Bright indoor position when young, conservatory, greenhouse or outdoors during warm months

Collector Insight

One of the fascinating aspects of growing eucalyptus is observing the transition from juvenile to mature foliage. Young plants often look completely different from older specimens, and this transformation reveals how the plant changes its strategy as it develops.

Corymbia citriodora is also a reminder that plants communicate through chemistry. The lemon scent we enjoy is a sophisticated biological system that evolved over thousands of generations to help the plant survive in a challenging environment.

In cultivation, I have found that restraint produces the best specimens. Plants grown with strong light, good airflow and moderate feeding develop a much more elegant structure than plants pushed with excessive nutrients.

Cultivation Guide

Light

Corymbia citriodora requires abundant light.

The ideal position is:

• full sun outdoors
• very bright greenhouse
• sunny conservatory
• brightest possible indoor location when grown temporarily inside

Insufficient light results in weak, elongated growth and reduced fragrance.

Temperature

Ideal growing temperatures:

15–30 °C

Young plants are sensitive to frost and should be protected from temperatures below approximately 5 °C.

In Central European climates, it is best treated as a container plant:

• outdoors during warm months
• overwintered in a bright, cool, frost-free location

Water

During establishment, regular watering encourages strong root development.

Once established, the plant becomes considerably more drought tolerant.

The ideal approach:

• water thoroughly
• allow the substrate to dry partially
• avoid permanently wet roots

Humidity

Average indoor humidity is acceptable.

Good ventilation is more important than high humidity.

Substrate

A free-draining substrate is essential.

A suitable mix contains:

• mineral components
• pumice
• lava rock
• coarse sand
• a moderate organic component

Poor drainage can quickly damage eucalyptus roots.

Fertiliser

Feed moderately during active growth.

Excess nitrogen encourages overly soft growth and can reduce the natural compact character of the plant.

Repotting

Young plants benefit from regular repotting as roots develop.

Choose deeper containers because eucalyptus species naturally produce extensive root systems.

Propagation

Usually propagated from seed.

Commercial and collector propagation can be challenging because maintaining healthy young plants requires suitable light, moisture and temperature management.

Dormancy

In cooler climates, growth naturally slows during winter.

Reduce watering and maintain a bright, cool environment.

Common Mistakes

The most common cultivation mistakes are:

• insufficient light
• overwatering
• keeping the plant too warm and dark during winter
• using heavy, poorly draining soil

Eucalyptus roots require oxygen. A constantly wet substrate creates conditions very different from the dry Australian soils where the species evolved.

Cultivated with Care at TOMs FLOWer CLUB

At TOMs FLOWer CLUB, Corymbia citriodora is cultivated with emphasis on long-term plant health rather than rapid production.

Plants are grown carefully, avoiding excessive fertilisation and encouraging naturally strong growth. A well-balanced, permeable substrate supports healthy roots and prepares the plant for successful adaptation to its new environment.

The goal is always the same: quality before quantity and plants that continue developing beautifully over time.

What You Receive

You receive the plant in the displayed size and cultivation quality.

Each specimen has been carefully grown and prepared for successful continuation in your collection.