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Photo: Geekstreet, CC BY-SA 4.0 (via Wikimedia Commons)

Southern Blue Gum

Eucalyptus bicostata

Also known as Eurabbie, Blue Gum, Southern Blue Gum

At a glance
Family
Myrtaceae (the myrtle family)
Type
Evergreen tree
Parts used
Leaves; oil distilled from the leaves
Size
A towering tree, often 100 to 150 feet (30 to 45 m) at maturity
Bloom
Clusters of small cream-white flowers, typically summer into autumn
Habitat
Native to the cool, moist tablelands and foothill forests of southeastern Australia
Acquisition
Grow or buy
This plant in HerbSense

Key benefits

Clears a stuffy head
Soothes scratchy throats
Freshens indoor air
Eases tired, achy muscles

Traditional uses

Long before eucalyptus oil lined pharmacy shelves, Aboriginal Australians turned to the leaves and bark of blue gum eucalypts for wounds, fevers, and the aches of everyday life, often crushing the leaves to release their sharp, camphor-like scent for inhaling. Eucalyptus bicostata, known regionally as Eurabbie, became one of the tall timber and oil trees settlers prized both for its hardy lumber and for the cineole-rich oil pressed from its foliage. As colonial and later Western herbalism adopted eucalyptus, steam inhalations and chest rubs made from its leaves and oil became a household staple for the stuffy head and heavy chest that come with a winter cold. That legacy lives on today, mostly through the same gentle, external rituals that first made this tree beloved.

How to grow & use it

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  • Growing guide
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Pairs well with
  • Peppermint
  • Thyme
  • Rosemary
Substitutes
  • Tea Tree
  • Peppermint
Choose it when

For when a stuffy head is asking for a clear, cool path to breathe again.

Did you know?

The soft blue-grey haze that hangs over Australia's Blue Mountains comes largely from eucalyptus oil, the same volatile compounds packed into blue gum leaves like these scatter sunlight as they evaporate into the air on hot days, tinting the distant forest a hazy blue.

Safety

Eucalyptus essential oil is toxic if swallowed, even in small amounts, and can be dangerous to children and pets, so it's used only externally or inhaled, diluted for skin use, and never taken internally. It may also interact with sedative or diabetes medications.