Pu-erh is a town in Yunnan, China; which was once famous for its tea trade. There are many forms of pu-erh tea (after oxidized tea) but none are grown and processed in the town. The many "after oxidized" teas from this region were once heavily traded and exported from pu-erh town (which is how this tea category got its name) but through a long period of civil unrest and disaster the tea trade diminished in the once boom town of tea. The "Pu-erh" teas come from a tea varietal known as "Da Yeh"(broad leaf type). Which have been propagated from pre-historic tea trees that are as old as 1800 years old. This broad leaf variety of tea is the camellia assamica evergreen and is best suited to warm and humid growing conditions.