Gu Shu Single Tree (單株茶, Dān zhū chá, "Single Trunk Tea") - The nature of Sheng Pu'er appreciation emphasizes the Qi of the plant more heavily than the flavor or fragrance. As such, the most highly prized Pu'er comes from tea trees of advanced age that have had a long time to accumulate Qi. This is known as Gǔ Shù Chá 古樹茶 ("Ancient Tree Tea"). Because ancient trees are all genetically distinct, and also because they are rare, a given batch of ancient tree Sheng Pu'er would generally be sourced from a diverse assortment of related but not identical tea plants. In order to achieve a distinctive profile in tea made from these ancient plants, one must narrow their source material to plants growing in increasingly smaller patches. The Gu Shu Cha harvested from a single patch carries a more well-defined dì wèi 地味 ("earth taste") with each patch having its own unique attributes. The natural conclusion of this ever-increasing specificity is tea made from small clumps of trees and ultimately from one single tree. Even a very large, centuries old, tea tree will only be able to produce a few kilos a year in leaves. The trees selected to be subjected to this extraordinary process are themselves generally remarkable. This particular Single Tree Pu'er comes from a very large tree of indeterminate age on the east-facing peak of Nannuo Mountain. Because it overlooks the city of Jing Hong, this tree is named Guān Jǐng 觀景 ("The One Who Watches The Scenery"). This unique Pu'er has a bitter taste and conveys the Qi of centuries of scenery watching.