Native to China, cassia is an aromatic evergreen tree with a documented history of use reaching back to Biblical times. It is one of several varieties of Cinnamomum used for its aromatic bark, and it typically grows to a height of 30−50 feet. In the Bible’s Old Testament, Cassia was mentioned as a holy anointing oil and was a key ingredient in temple incense. Closely related to Ceylon cinnamon, which is used to obtain Cinnamon Bark essential oil, Cassia has a slightly sweeter aroma with higher levels of coumarin and trans-cinnamaldehyde.