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It’s All in the Details

Eucalyptus Tree


Everything you need to know about the eucalyptus tree, from identification tips to typical characteristics; how to spot disease and the best way to maintain an eucalyptus tree.

The highly aromatic and fast-growing eucalyptus tree is native to Australia and only around 12 of its numerous species grow in Europe’s warmer regions. Also known as the gum tree due to the red colored resin that oozes from the bark, the eucalyptus tree will vary quite substantially in appearance, from a short bushy shrub through to a tall evergreen tree up to around 30 meters in height.

Eucalyptus is part of the very large Myrtaceae otherwise known as ‘myrtle’ of which the bay rum tree, guava, clove, and allspice also belong. Only the hardiest variations of the species do well in Britain due to its preference for a warmer climate.

The cider gum tree (Eucalyptus gunnii) is found in abundance on the Essex coast, and the Tasmanian blue gum (Eucalyptus globulus) is in prevalent in Cornwall and Ireland.

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General Facts



(Eucalyptus sp.)

Eucalyptus is from the large Myrtaceae family. These aromatic trees are native to Australia and only about 12 of the many species grow in the warmer regions of Europe. Eucalyptus is often also known as gum trees because they sometimes exude a red resin from breaks in the bark.

Adult leaves of Eucalyptus are long and set on single stalks droop downwards. (Photo: northeast

Eucalyptus can vary in form from a short shrub to a tall evergreen tree. 

Eucalyptus oil comes from the adult leaves. 

Adult leaves are long and slender and hang downwards from single stalks.

Young leaves are round and blue, and older leaves are long and slender. 

The bud cap falls off to reveal the fluffy white or red flower stamens 

Eucalyptus flowers display fluffy white (and sometimes red) stamens which attract bees. 

Flower buds are cone-shaped and grouped in sets of three on short stalks

Buds are cone-shaped and grow in clusters of three on stalks. (Photo:

Eucalyptus bark is blue-grey and peels in strips revealing orange or yellow below (Photo:

The blue-grey bark and peels in strips revealing yellow patches underneath 

Common name: eucalyptus, gum tree

Scientific name: Eucalyptus sp.
Family: Myrtaceae

UK provenance: non-native

Interesting fact: eucalyptus oil is highly flammable, and fires travel easily through large plantations, especially in Australia where the weather is hot. However, reports that eucalyptus trees can spontaneously combust are untrue.

What does eucalyptus look like?

Overview: they can vary in form from a short shrub to a tall evergreen tree. The bark is a blue-grey color and peels off in strips revealing yellow patches underneath.

Leaves: best identified by the blue-green adult leaves that are long and slender and hang downwards from single stalks. Juvenile leaves on younger trees are blue, round and unstalked. Eucalyptus oil comes from the adult leaves which exude the unmistakable scent when crushed.

Flowers: flower buds are cone-shaped and grouped together in sets of three on short stalks. Each bud has a round cap on top called the eucalyptus, which falls off to reveal the fluffy white or red flower stamens that are so attractive to bees.

Fruits: in the middle of the flower a hard, woody pod develops that opens to release seeds. 

Look out for: young leaves are usually stemless and rounded. Adult leaves are long and stalked. When crushed, leaves have a distinctive smell. Flowers look like tassels of stamens, opening a year after buds are formed.

Could be confused with: two of the most common species of eucalyptus in the UK are the cider gum (Eucalyptus gunnii) which can be found in great numbers on the Essex coast, and the Tasmanian blue gum (Eucalyptus globulus) which is the main source of eucalyptus oil and grows plentifully in Cornwall and Ireland.

Identified in winter by: eucalyptus is evergreen so its leaves are present year round.

Where to find eucalyptus

Eucalyptus are fast-growing trees and are widely planted in gardens, parks, amenity areas and forestry plantations. It has become naturalised in woodland and on roadsides in southeast and lowland England. Some species occasionally regenerate from seed in the UK.

Value to wildlife

Eucalyptus attracts bees and other pollinating insects. Leaves have a have a high level of essential oils which are difficult for most animals to process.

Famously, in Australia, it is the choice food of koalas.

Mythology and symbolism

Australian indigenous populations used eucalyptus for spiritual cleansing. Eucalyptus oil is widely known for its medicinal properties, which has added an air of magic and mystery to the reputation of the tree.

How we use eucalyptus

Australian indigenous populations had many uses for eucalyptus trees. They used the wood and bark to make tools, spear throwers, shields, canoes, musical instruments. Leaves of certain species were soaked in water making a healing tea. The Kulin people of Victoria made water bowls from the tree known as tarnuks. The Murray river tribes were known to use the bark to make canoes.

Oil from the leaves of eucalyptus trees is now used all over the world for its antiseptic qualities. It's used medicinally to help clear congestion and colds. It also appears in some topical creams for arthritis and insect repellents.

Most commonly the wood from tree is used for timber and pulpwood for paper production.


There are not many threats to eucalyptus but it can suffer from eucalyptus gall wasp. The larvae of the gall wasp develop inside raised galls on the leaves which can result in excessive leaf wall.


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