Patchouli, Pogostemon cablin, is a low-growing herb in the mint family whose leaves are used to create patchouli essential oil for perfume. The scent is strong, earthy, spicy, and woodsy. Patchouli absolute and CO2 are also available, and special fractions have also been developed to "clean up" the scent, focusing on the woodsy and spicy aspects and minimizing the earthy ones. Patchouli oil improves with age, so many perfumers buy it and store it for a few years before using it in production.