Eucalyptus is a general name for up to 750 different species of the genus, of which at least 500 produce essential oils.  There are many sub species and chemotypes.  The main essential oils producing types are Eucalyptus Globulus (Blue gum), Eucalyptus radiata (narrow leaved peppermint gum), Eucalyptus Citriodora (lemon-scented Eucalyptus), Eucalyptus Smithii (Gully gum) and Eucalyptus polybractea (Blue Mallee).

Eucalyptus oils have widespread applications in mouthwashes, inhalers, hygiene and cleansing products (soaps and detergents), room sprays, food flavouring and perfumery.

In aromatherapy they are effectively used for skin care, the respiratory system, the immune system, the nervous system, the urino-genital system and the musculo-skeletal system.

When choosing a “Eucalyptus” you should bare in mind what you’re going to use it for.  We’ve created a little cheat sheet to help you decide which is best for you when choosing from Eucalyptus Globulus (Blue gum), Eucalyptus radiata (narrow leaved peppermint gum) or Eucalyptus Citriodora (lemon-scented Eucalyptus).

• Similarities
  • All from the myrtle family, steam distilled & native to Australia
  • All have a clearing action on the mind/ head, being stimulating, cooling and refreshing
  • All are excellent for skin, muscular aches & respiratory complaints
• Differences
  • Radiata can be used with effect on the reproductive system
  • Lemon & Blue Gum can help with urinary complaints
  • Blue Gum & Radiata can be used for digestive complaints
  • Lemon is great for circulatory problems and boosting the immune system in cases of infectious disease
  • Blue Gum is the most widely known and used.  Especially good for infections of the respiratory tract but also for treatment of rheumatism, arthritis and wounds. Great for purifying air and the trees produce ozone.
  • Lemon is lemony in fragrance and is more cooling in action than the E.globulus. Its key constituent is citronellal, an aldehyde. This variety of eucalyptus is better to use when mucus secretions are yellow indicating infection and heat in the body. It’s also a great insect repellent especially helpful against cockroaches and silverfish. One important point about E.citriodora is that it is mild and thought to be best for children because of its lemony fresh smell.
  • Radiata is very antibacterial, antiviral and an expectorant oil that is great not only for respiratory conditions but is especially good for sinus infections. It is by far the gentlest and most effective of the eucalyptus oils since is it so low in aldehydes, which distinguishes it from E. globulus and E. dives.
• Contra-indications:
  • Radiata – infrequent use only, overdose can cause muscular weakness, indigestion, nausea, vomiting & diarrhoea.  Not to be used on broken or irritated skin
  • Lemon – Irritant on sensitive skin, low doses in massage and not for internal use
  • Blue Gum – Negates homeopathic remedies, and can be skin irritant

See also: The many shades of Lavender, Manuka, Kanuka & Tea Tree Essential Oils