Essential oil citronella 10ml a fresh aroma that keeps pests away as you may have guessed from the ‘citron’ in its name, citronella is a citrusy oil derived from citronella grass, which has a sweet, lemony flavor and aroma. citronella grass, and its cousin lemongrass, both yield a wonderfully pungent and sweet oil that insects, particularly mosquitos, find abhorrent. too bad for them, as citronella oil is a delightful aroma and flavor for almost everyone else… citronella oil is a popular ingredient in many perfumes and fragrances, and is often used in soaps, fragrant candles and potpourris. because of its refreshing and invigorating lemon aroma, citronella oil is a common ingredient in many natural cleaning products.