Oregano grows wild throughout the world, but is native to the Mediterranean area. Oregano is a member of the labiate-mint family, it is closely related to and sometimes confused with Marjoram and Thyme. Oregano essential oil is produced from the oregano plant through the process of steam distillation. There are a variety of species referred to as oregano, but only a few qualify as high grade and are suitable for making oregano essential oil. Wild oregano (Oreganum vulgare) has the most potent medicinal qualities. Oregano essential oil should be made only from high-grade oregano that grows wild in the mountains of the Mediterranean.