Latin Name: Origanum Vulgare Plant Part Used: Leaves and Flowers Source: Spain Extraction Method: Steam Distillation Aromatic Description: Herbaceous, sharp, green, camphoraceous Oregano is one of the strongest and most potent essential oils and has been used for centuries in traditional practices. Due to its high phenol content, care should be taken when inhaling or diffusing oregano; one or two drops are enough.