Now Citronella Oil 30 MlThe citronella (Cymbopogon winterianus) in Nows Citronella Oil is 100 percent pure and extracted by steam distillation of the fresh and dried citronella grass. Steam Distilled from fresh and dried citronella grass. The integrity of an essential oil is determined not only by the botanical, from which its derived, but also by the harvesting and extraction methods used to bring the finished oil to life.