From a single leaf to the fragrant cup, ensuring the soup’s perfect presentation requires that every link be perfect: the raw material, the craft, the storage, the brewing. Because pu-erh tea “grows more fragrant with age,” storage stands out as decisive in forming pu-erh’s quality. It is fair to say that for pu-erh, scientific and sound storage is nothing less than the continuation of processing. So what rules does pu-erh storage actually follow?
Through years of accumulated data and experience in storing pu-erh, teacher Shi Kunmu discovered the periodic law of pu-erh’s storage transformation. This law offers important guidance for controlling pu-erh’s storage and transformation.
The storage environment
Through long years of storing pu-erh, teacher Shi Kunmu found that pu-erh’s demands on storage conditions are not harsh. In fact, anywhere humans can live for long periods suits the keeping of pu-erh.
Among the elements of the storage environment, the four main factors affecting pu-erh’s aging are: temperature, humidity, ventilation, and freedom from stray odors. Secondary conditions are: heavy pressure, and turning the stacks. The storage environment teacher Shi observed was: temperature 20-30 degrees C, relative humidity 65-75%, relatively ventilated and free of odors, and — the quantity being small — no issues of heavy pressure or stack-turning. For most tea lovers, heavy pressure and stack-turning are rarely encountered; master the four essentials of “temperature, humidity, ventilation, no odors” and pu-erh’s basic storage needs are secured.
The tea itself
Different teas, under the same storage conditions and time, transform differently. The tea’s material (tree age, management, region, grade), the primary processing, the compression form — all shape the result. Among raw teas of the same region made by similar craft, plantation tea (taidi) and young-tree tea take far longer than ancient-tree tea to reach the same transformation.
Classified by the Chinese-medicine theory of “cold, cool, neutral, warm, hot,” new plantation/young-tree tea is cold in nature, while newly made ancient-tree raw tea is cool (assuming both are correctly primary-processed). Through storage transformation, the tea’s nature trends “cold → cool → neutral → warm-hot.” Taking each shift in the tea’s nature as a marker, one finds the tea’s transformation follows a broadly identical periodic law.
Under the environmental conditions above, teacher Shi Kunmu found the transformation cycle of plantation/young-tree tea to be about seven years, and that of ancient-tree tea about five. After one storage-transformation cycle, the tea’s nature changes and its drinking performance reaches a peak for that period. Given the innate difference in nature between ancient-tree and plantation/young-tree tea, plus the difference in quality, the gap in quality and drinking experience between them only widens as storage years accumulate.
Take the 2006 Jingmai organic series “earth cake”: the same tea, after 8 years in two utterly different storage environments — Beijing and Kaohsiung, Taiwan — already shows marked differences. On the outside, the wrapper of the Beijing-stored tea remains clean, while the Taiwan-stored tea, kept in a comparatively warmer and more humid environment, shows “oil stains.”
Such “oil stains” come from the higher average humidity of the storage environment. In the more humid south, surface oiling is fairly common; even in the drier north, sufficiently old teas, or cakes stacked low under heavier pressure, show the same “oiling.” Many newcomers to pu-erh — especially those with little contact with aged teas — lack the experience and scientific grounding for such oiling and take it for damp damage or a wet-storage fault. That view is incorrect.
In liquor color, the Beijing-stored earth cake pours paler but brighter; the Taiwan-stored tea runs redder and deeper. The Beijing-stored tea shows higher, more lifted aroma and a cleaner, crisper mouth, with clear, strong cha-qi; the Taiwan-stored tea offers a finer, silkier soup, deeper tea-rhyme, and cha-qi that moves from surface into depth. Each has its own merits.
On the spent leaf, the Taiwan-stored tea’s leaf bottom is visibly darker than the Beijing-stored one — again reflecting the differing pace and cycle of transformation in the two places.
It should be noted that the cycle law of five years for ancient-tree and seven for plantation/young-tree tea was summed up by teacher Shi Kunmu from years of observation in the particular climate of southern Taiwan (Kaohsiung). When the environment changes, the storage cycle must be adjusted accordingly. Generally, where a locale’s annual mean temperature and humidity both run below the conditions above, the cycle lengthens — for a tea stored in Beijing, add one to two years to the cycle of the same tea stored in southern Taiwan.
Teacher Shi Kunmu first shared his storage-transformation data with the industry selflessly in 2003, yet some unscrupulous operators plagiarized his findings while ignoring the environmental conditions noted in his data, applying one transformation law stiffly to every tea in every place — to much ridicule.
Direction of transformation
Beyond speed and cycle, storage conditions also affect the direction of a tea’s transformation. Generally, in regions of higher annual mean temperature and humidity, the cycle is shorter; harshness fades sooner and the soup grows mellower sooner. In cooler, drier regions the cycle lengthens, but the tea keeps more of its aroma and its cha-qi performs even better.
The silent period
At roughly the halfway point of a transformation cycle, because the tea’s various inner substances transform on uncoordinated schedules and cannot yet complement one another, the tea’s taste turns scentless, bland, thin and hollow — even sour or muddled — as though its fine inner qualities had fallen silent. Hence the name “silent period,” also called the awkward period. Something similar occurs in wine that needs years to mature. Meeting a silent period, one need only wait it out: the tea’s aroma and taste gradually return, and rise to a new height — a truth many tea friends with years of storage experience know in their bones.
Once a tea has passed more than one transformation cycle, its active substances gradually turn inert; from the second cycle onward, the silent period shortens and the quality deviations within it shrink. So the most conspicuous silent period generally appears only within the first cycle.
The Aged Ancient-Tree Raw Tea Collector’s Set went on sale recently. The teas it contains were all made in 2006-2007 and have since passed multiple storage-transformation cycles under the professional storage of the Classic Pu-erh system; their nature has turned neutral-warm — living proof of teacher Shi Kunmu’s cycle law of pu-erh storage. They are now in their launch promotion period, with spend-and-save offers; tea lovers, seize the chance. Details: [New Release] The Aged Ancient-Tree Raw Tea Collector’s Set on Sale Today
Author: Shi Kunmu Classic Tea Culture,
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Author: Lam Sam (LamSam), the Old Tea Head
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