Patchouli oil is an essential oil derived from the leaves of the patchouli plant, a type of aromatic herb.
In order to produce patchouli oil, the leaves and stems of the plant are harvested and allowed to dry out. They then undergo a distillation process to extract the essential oil.
 
Patchouli oil has a characteristic scent that might be described as woody, sweet, and spicy. Because of this, it’s often used as a scent additive in products like perfumes, cosmetics, and incense.