Citronella oil is extracted from a resilient grass (Cymbopogon nardus) native to Sri Lanka and Java. It is a very aromatic perennial that grows approximately 1 meter (3 feet) in height. Disclaimer: Please note the International Federation of Aromatherapists do not recommend that Essential Oils Carrier Oils or Hydrosols be taken internally unless under the supervision of a Medical Doctor who is also qualified in clinical Aromatherapy.