Vetiver is a grass, not dissimilar to lemongrass and citronella. The root base which is what is distilled for essential oil â?? is thick and matted. While growing, it can preserve soil structure, and harvested the root base is often traditionally used as a fragrant floor mat, among other varied uses. Vetiver essential oils fresh, herbaceous scent and some of its applications reinforce its similarities to citronella and the like, though vetiver has many other properties that set it apart.