Wet piling vs golden flower
The two deliberate microbial operations in tea, and they differ on a point that matters: whether the maker is managing a mixed population or cultivating one named organism. Fu Zhuan is the only well-known tea in which a specific fungus is grown on purpose and graded by eye.
What is being compared
Why these get confused
‘Fermented tea’ covers both, plus natural ageing, plus — wrongly — oxidised black tea. Four processes, one word, and it is the single largest source of confusion in dark tea.
Point by point
| Aspect | Wet piling (wo dui) | Fungal flowering (jin hua) |
|---|---|---|
| The organisms | A mixed and largely uncontrolled microbial population. | Eurotium cristatum specifically, established throughout the brick. |
| Visible result | None. The change shows as colour and smell rather than as anything you can point at. | Distinct golden specks throughout the brick, and their presence is the grading criterion. |
| When it happens | On loose finished leaf, before pressing. | After pressing, on the formed brick. |
| Conditions | Heaped, dampened, covered, turned; heat builds inside the pile. | Held under managed temperature and humidity until colonisation completes. |
| What it gives | Earthy, woody, smooth; a strong pile note when young that fades over years. | Sweet, faintly mushroom-like and grain-like, and it softens the coarse leaf the format uses. |
| Where | Menghai and the Yunnan factories, from the 1970s. | Historically Jingyang in Shaanxi, on the theory that local conditions favoured the bloom; production later moved to Anhua with controlled chambers. |
| What is mistaken for it | Damp storage, which produces mustiness rather than pile character. | Grey or green growth, which is not the intended organism. Only the golden form is. |
The short answer
Both are microbial and only one is a monoculture, which is why Fu Zhuan is far more consistent brick to brick than shou is batch to batch. Golden flower is also the only case in tea where a visible mould is the specification rather than a defect.
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