With its low cost, diverse therapeutic potential and bright, spicy-lemon scent, Lemongrass is one of the best-known essential oils. The oil is steam distilled from Lemongrass’s yellow-green blades, which themselves have a citrusy aroma. Try diffusing a few drops of this essential oil to purify air and encourage calm and relaxation. Add a boost to your home cleaning products by adding a few drops directly to liquid soaps, solutions and counter sprays. Always dilute for topical use; neat application may cause skin-irritation.