What the practice is
A description of something people do now, compiled from published accounts rather than from practice.
Japanese green tea is picked in spring, and a substantial part of the crop is finished and then held rather than sold immediately. Kuradashi, a term meaning roughly a bringing out from the storehouse, describes tea held in cold store through the summer and released in autumn, and it is sold as its own thing rather than as leftover stock. The associated seasonal vocabulary marks the release: the autumn opening of the stored tea is an occasion in the trade rather than merely a shipping date. TeaHQ records this as a living practice compiled from published accounts rather than as a specification, and notes that usage varies between producers — the term is applied both to a deliberate maturation and, more loosely, to any autumn release of spring stock. What is consistent is the underlying structure: the tea was made in spring, kept cold and sealed rather than at ambient conditions, and offered later as a product whose character is understood to have changed. That is a quite different proposition from a tea that sat in a warehouse and is being sold quietly, and the difference is the intention and the conditions rather than the elapsed time.
Why holding a green tea is not a contradiction
The rule that green tea storage is preservation rather than cultivation is correct and it is a rule about ambient storage. Held cold and with oxygen excluded, a finished green tea changes very slowly, and what change does occur is not the flat, olive, cardboard-adjacent decline of a tea left in a warm cupboard. The character that is described for a matured spring tea is a settling: the sharp, green, sometimes aggressive edge of a very new tea softening, the sweetness reading as rounder, and the whole cup becoming less pointed. Whether that is an improvement is a matter of preference, which is exactly how the trade handles it — some drinkers prefer the immediacy of a new tea and some prefer the matured version, and both products are sold. The mechanism, so far as this catalogue will assert one, is that the same slow processes described in the storage-chemistry page are running at a greatly reduced rate under cold and low oxygen, so the tea moves a small distance along a trajectory rather than falling off it. This is not the ageing of a dark tea by any measure, and it is not the decline of a neglected one.
Why shincha exists at the other end
The same industry sells the opposite product with equal conviction, and the pair is what makes the point. Shincha is the first tea of the year, sold precisely because it is new, and its selling point is the fresh aromatic top that is the first thing any green tea loses. Buying it late in the year defeats the product rather than merely diminishing it. So a single producer may offer the same spring crop twice: once as shincha in the weeks after picking, and once in autumn after months of cold storage, as two distinct things. Neither is the leftover of the other. This is the clearest available demonstration that the freshness rule in this catalogue is about a category’s dominant vector rather than about a moral position on age, and that the interesting question about any tea is not how old it is but what conditions it has been in and what it was made to become. A drinker who has tasted both from the same producer in the same year has run the most instructive storage experiment available in Japanese tea, and the two are usually on sale at the same time in autumn.
The commercial logic underneath
The practice is not only aesthetic. A crop harvested over a few weeks has to be sold across a year, and cold storage is the mechanism that allows a producer to release stock as demand arrives rather than dumping it. Every part of the Japanese supply chain that Sprint 31 describes — packing with oxygen excluded, holding in cold rooms, drawing and packing to order — exists to make that possible, and kuradashi is the customer-facing name for the last step of it. Recognising the commercial function is not a debunking. It is why the practice is reliable: the conditions are maintained because a business depends on them, not because a tradition prescribes them. It also sets a fair standard for scepticism. Where an autumn release is genuinely a matured product, the seller can describe the storage; where the term is being applied to ordinary held stock, they generally cannot, and the difference is the same difference that runs through every age claim in this catalogue. A seller who describes conditions is telling you something checkable in principle, and one who offers only a season is offering the less informative half.
What a household can and cannot reproduce
The conditions are the four Sprint 31 lists and a kitchen reproduces none of them: oxygen excluded before the tea goes cold, a dedicated space holding nothing but tea, a stable temperature undisturbed by daily opening, and the pack warmed fully before it is opened. A domestic refrigerator fails on all four, which is why the general advice not to refrigerate an open container stands regardless of this page. What a household can do is the portion-and-freeze method, which reproduces the important part of the arrangement — one temperature cycle per portion rather than fifty — and which is a preservation technique rather than an attempt at maturation. Anyone curious about the matured character is far better served by buying an autumn-released tea from a producer who did it properly than by attempting it at home, and the cost difference is small. This is the same conclusion the re-firing page reaches about aged oolong, and for the same reason: some of the operations in tea are supply-chain capabilities rather than techniques, and the honest domestic response is to buy the result rather than to approximate the process.
Where else the same idea appears
Deliberate holding of a category otherwise sold fresh is rarer than the ageing traditions but not unique. Roasted oolong is genuinely improved by a settling period after firing and is frequently held for some months before sale, which is why a shop selling a tea it roasted last week is selling something unfinished. Some Chinese green teas have small local traditions of deliberate keeping, which Sprint 31 records as specific practices rather than a general licence. And in Wuyi the interval between roasting and release is a recognised part of the making rather than a delay in it. The common thread is that a producer is choosing when a tea is ready rather than assuming that the earliest possible sale is the best one. For a buyer the useful question that falls out of this is simply when a tea was made and when it was released, since the gap between the two is a decision somebody took. A seller who can answer both is describing a product; one who can answer neither is describing a purchase, which is the distinction this catalogue keeps returning to.