Rotten Stones Are Not Rotten: Lu Yu's Soil Taxonomy

Photo: Wikimedia Commons · CC BY 4.0

Thesis

Chapter One grades soil as 烂石, 砾壤 and 黄土. Chen Wenhua’s reading of 烂石 is weathered rock that has broken down into a loose, sandy, well-drained medium — not literal rotten stone. It is an empirical description of high-mountain tea soil, not literary exaggeration.

Modern tea science supplies the mechanism: tea prefers acid soils, roots form mycorrhizal associations, and a gritty structure prevents waterlogging while supporting aeration. Lu Yu had no pH meter, but his ranking brings structure, drainage and fertility into one judgment.

The misreading to avoid is equating 烂石 with “the poorer and stonier, the better”. The key is weathering and structure, not stones as such. Today one still has to check soil depth, organic matter and moisture.

Source: 中国茶叶流通协会·自然科学元素

This piece pulls “Rotten Stones Are Not Rotten: Lu Yu’s Soil Taxonomy” back into the text. The first move is to limit the claim: Lu Yu writes about Tang tea, Tang soil and Tang brewing; change the conditions and the conclusion has to be rewritten.

From the making side, a small change in plucking standard changes the sweet-bitter balance in the cup. The sentence is not a study-room abstraction; it has an operational background.

Modern tea science can split it into cultivar, soil, light and plucking variables, but the variables must be put back together. Using one of them to prove the whole passage is over-reading.

Textual caution still matters. Chapter One has variants, especially around 其字, 其名 and the plant description; cite the edition or the argument may rest on sand.