Patchouli (Pogostemon cablin) essential oil has a unique rich, earthy aroma and is popular for its many uses and peaceful, calming attributes. The patchouli plant is a tropical member of the lamiace? family. Distant relatives include lavender, rosemary, and other herb plants associated with temperate regions. Because the aroma has lasting effects, the oil is an important fixative ingredient in fine perfumes and cosmetics.