Aroma

All Eucalyptus have oil producing glands in their leaves which give their characteristic odour. They may also be in the bark and in the flowers.  There are more than 15 essential oils found in the Eucalyptus genera. Usually between one and four are found in different combinations and quantities in each species which, in turn produces a slightly different aroma for each one. The Aborigines found that oils from certain Eucalypts had a beneficial effect on colds, influenza, toothache, headaches, fevers, diarrhoea and skin sores. Certain oils are used in perfumery, drugs, disinfectants and deodorants. See also medicinal uses

Some are 'fruity' e.g. E. glaucescens, E. nitens and E. macarthuri, others pungent e.g. E. crenulata and E. gunnii, others have a pleasant mixed peppermint and Eucalyptus aroma e.g. E. coccifera, E. nicholii and E. nitida. One of the strongest is the lemon scent of E. citriodora. The concentration of these oils are usually higher in the juvenile and immature leaves