The use of Senna as an herb apparently predates written records. Senna is native to Arabia and Somolia but it now grows in most tropical parts of the world where there is rich soil. This Senna, also called Alexandria Senna, reaches up to 3 feet in height and has pale green stems with brittle, olive green leaflets, which are usually consumed as a tea. Senna is frequently combined with aromatic herbs such as Cinnamon, Ginger, Anise, and Fennel. Try adding fruit to make a tasty treat.