Tsuru Collection 鶴

No. 043

How is tea stored by the supplier?

After production begins a much less visible stage: preserving the tea before it reaches the merchant.

The tea is made. It is dried, sorted, sometimes rested, and ready to leave the world of the factory. Yet, before reaching a merchant, it may still spend several weeks or several months in the reserves of a producer, exporter, wholesaler, or supplier.

It is a silent stage. It has neither the spectacular gestures of rolling, nor the heat of fixing, nor the aromas of an oxidation room. Bags, boxes, crates, or large packages simply wait in a storage space.

And yet, part of the quality of the tea is still at stake here.

Dry tea is not a perfectly immobile object. Its aromatic profile can continue to evolve. It remains sensitive to humidity, temperature, oxygen, surrounding odors, and sometimes light. Depending on its family, its packaging, and the desired result, the precautions will therefore not be exactly the same.

The question of this Tsuru is therefore very precise:

1. Storage begins when production is finished

In the previous Tsuru, we followed the journey of the leaf during its transformation. Once drying and final operations are finished, the tea now has a profile that is generally sought to be preserved.

It is no longer a matter of making the tea. It is a matter of maintaining as much as possible the characteristics obtained during this production.

At a supplier, teas are not necessarily stored in the small formats that you see later in the shop. They may arrive in professional packaging containing much larger quantities. They are identified by batches, references, origins, or dates depending on the organization of the company.

Professional storage then serves several functions: protecting the tea, allowing inventory management, maintaining traceability, preparing orders, and preventing different batches from being confused.

The exact methods vary greatly depending on the countries, suppliers, and tea families. There is therefore no universal tea warehouse with identical temperature and methods everywhere.

What does exist, however, are particularly important preservation principles.

2. First enemy: humidity

Drying constitutes one of the essential turning points in tea production. By greatly reducing the amount of water present in the material, it notably allows the product to become much more stable.

But this low water content is not permanently acquired.

A dry product can exchange moisture with the air around it. If its packaging lets water vapor pass through too easily, or if the storage conditions are poor, the tea can regain moisture.

This regain is problematic because it promotes different chemical evolutions and alterations of the product. It can also compromise its stability if the conditions become truly unfavorable.

This is why, at a supplier, tea boxes and packaging should not be considered as simple logistical containers.

This is also the reason why storing directly in a damp area, against a wall subject to condensation, or in a space where the air varies greatly would be a bad practice.

3. Temperature: slowing down rather than freezing

Heat accelerates many chemical reactions. Tea is no exception.

Studies conducted on green teas clearly show that their sensory evolution can be strongly influenced by the storage temperature. In a study on Huangshan Maofeng, researchers compared teas stored at different temperatures for several months.

The warmer the conditions, the faster the freshness of the color, taste, and aromas degraded.

But a crucial nuance must be immediately added.

These experimental results do not mean that every tea supplier must store all its teas at −20 °C. Turning an optimal experimental condition for a specific green tea into a general rule for trade would be scientifically incorrect.

The needs depend on the tea family, the storage duration, the packaging, and the desired profile.

What the study demonstrates very clearly, however, is that temperature matters.

A serious supplier must therefore avoid, as much as possible, conditions of excessive heat or unnecessary thermal variations, especially when the desired product must maintain a fresh and delicate expression.

4. Oxygen: invisible, but very much present

When we talk about oxidation in tea, we often think of the production stage of black tea or certain Oolongs.

Yet, once the tea is dry, other oxidative phenomena can still occur much more slowly.

Contact with oxygen contributes to the evolution of several molecules responsible for taste, color, and especially aromas.

A recent study on Longjing showed that an oxygen absorber used in the packaging could slow down the aromatic deterioration during storage at a relatively high temperature.

Researchers notably observed a better preservation of the aromatic profile when the presence of oxygen was limited.

This is valuable information to understand the role of professional packaging: they are not only used to keep the leaves together.

They create a barrier between the product and its environment.

To remember

Good storage generally does not seek to improve the tea. It first seeks to slow down what could alter it.

5. Light: an additional precaution

Light can also play a role in the degradation of certain food compounds. This is why many professional packages intended for tea are opaque or placed in boxes that naturally block light.

At a supplier, this protection is generally easier to ensure than in a shop: large packages are not displayed in shop windows.

Storage takes place in reserves, boxes, or containers that naturally limit this exposure.

Again, it is not about imagining that a few seconds of light destroy a tea. The problem is prolonged and repeated exposure.

6. A tea warehouse should not smell like perfume

Tea has a particularity that is sometimes used voluntarily: it can capture aromatic compounds from its environment.

This ability explains notably certain flavoring methods where tea is voluntarily placed in the presence of aromatic materials.

But in a warehouse, this property can become a flaw.

Storing a neutral tea near strongly odorous substances creates a risk of altering its profile. Perfumed cleaning products, spices, coffee, essential oils, or other powerfully aromatic materials therefore have no place in direct contact with an unprotected tea stock.

This also explains why different batches must remain properly sealed.

In a catalog containing Earl Greys, spice blends, and delicate plain teas, separation and the quality of packaging become particularly important.

7. The container is part of the preservation system

The choice of professional container depends on the commercial circuit, volume, storage duration, and the tea.

Batches can be protected in multi-layer bags, inner liners, crates, boxes, or other solutions offering different levels of barrier to humidity, air, and odors.

It would be wrong to claim that a single material is always superior.

Effective protection must be evaluated according to several criteria: moisture permeability, oxygen permeability, mechanical resistance, food contact suitability, aromatic protection, and actual transport and storage conditions.

Once a large package is opened, management becomes even more important. Opening introduces air and exposes the contents more to its environment.

At a supplier who regularly prepares orders, the packages must therefore be properly resealed after withdrawal.

8. Not all teas age the same way

This is probably the most important point to avoid a simplistic rule.

A green tea sought for its vegetal freshness is not stored with exactly the same intention as a dark tea intended to evolve.

Studies on green teas show that freshness characteristics are particularly sensitive to time and temperature.

Black tea generally has a different profile, but it is not immutable.

A study on Keemun compared a fresh black tea and a comparable tea stored for one year. Researchers observed a decrease in several key volatile compounds. The aromatic profile had therefore truly evolved during storage.

The floral, malty, fresh, or vegetal notes linked to certain compounds did not remain exactly identical over time.

This demonstrates an essential idea: a dry black tea is not more frozen than a green tea.

Its evolution is simply different.

9. And the teas we precisely want to make evolve?

Until now, we have considered storage as a way to slow down transformations.

But this logic has exceptions.

Certain dark teas and certain Pu-erhs are precisely sought for their evolution over time. In this case, storage is no longer simply about preserving an initial state.

Temperature, humidity, air circulation, and duration become parameters that can participate in the desired evolution.

However, this controlled aging must not be confused with negligent storage.

Leaving a tea in a hot and damp room is not an aging method.

This is precisely the distinction we studied in Tsuru No. 018 dedicated to the aging of tea .

10. Storing also means knowing what you have

The physical preservation of tea is only part of a supplier's work.

It must also preserve its identity.

A professional stock is made up of batches. These can be tracked by an internal reference, a batch number, an origin, a receipt date, a supplier, or other useful information depending on the company's organization and applicable obligations.

This traceability allows avoiding the unintentional mixing of two goods that are not identical.

It also allows finding the origin of a product and managing stocks coherently.

We have dedicated several Tsuru to this question, notably Tsuru No. 016 on traceability .

Professional storage therefore finds itself at the meeting of two worlds: the preservation of the product and the preservation of its identity.

11. Batch rotation

Even perfectly stored, a tea intended to be consumed fresh is not meant to stay indefinitely in a warehouse.

Stock management must therefore take time into account.

This does not mean that a batch suddenly becomes bad on a specific date.

Transformations are progressive.

But when a supplier has several arrivals of the same tea, they must be able to identify their age and organize their circulation.

This logic prevents a box from remaining forgotten while a more recent arrival is used before it, when the type of product justifies a chronological rotation.

Once again, teas intended for aging constitute a different category and should not be automatically placed in the same logic.

12. What happens when a supplier receives a new batch?

Procedures vary from one company to another, but several operations are possible.

The batch can be visually inspected, identified, recorded, then placed in a storage area. Samples can be taken to perform controls or a tasting.

The tea can then remain in its original packaging or be transferred to another packaging adapted to the supplier's operations.

Some companies package products directly intended for their professional clients. Others keep large formats and take the necessary quantities as orders come in.

The regulations themselves bear witness to the importance of this stage.

In India, for example, the Tea Board provides a specific license for warehouses intended for the storage of tea used for auctions, blending, packaging, or export.

This shows that the warehouse is not a simple forgotten space between the factory and the sale: it is part of the professional tea industry.

13. Can tea be excellent leaving the garden and disappointing upon arrival?

Yes.

This is precisely what makes storage so important.

Terroir, cultivar, picking, and production can create an excellent tea.

But these qualities do not confer any invulnerability to the product.

Prolonged exposure to an unsuitable temperature can alter its aromas. Oxygen can accelerate certain changes. Humidity can compromise its stability. Foreign odors can contaminate its profile. Improperly resealing packaging can negate some of the initial protection.

The supplier does not necessarily create the quality of the tea.

Their role is largely to ensure it is not lost.

The Tribunal

“Once the tea is dried and packaged, the way it is stored makes almost no difference.”

Verdict: FALSE.

Drying considerably improves the stability of tea, but does not make it chemically inert.

Studies on green teas show that storage temperature can significantly alter their color, aromas, and sensory qualities. Research on Longjing tea also shows that reducing exposure to oxygen can slow some aromatic losses.

Even black tea changes: a study conducted on Keemun tea stored for one year observed a decrease in many important aromatic compounds.

A supplier who properly protects their stock therefore directly contributes to preserving the producer's work.

The Breath Ritual

Open, breathe, close

Take a tea you love.

Before brewing it, open its container and gently inhale the dry leaves.

Try to distinguish what appeals to you: a vegetal, fruity, woody, floral, roasted note, or simply this impression of freshness.

Then carefully close the container.

This gesture seems insignificant.

Yet, you have just reproduced on your own scale one of the principles applied since this tea left its place of manufacture: open only when necessary, then recreate a barrier against the environment.

Between the supplier's stock and your cupboard, the logic is ultimately the same: preserve for as long as possible what the tea has to tell.

Synthesis

Key Takeaways

The Journey of Tea

Production → professional packaging → supplier storage → order preparation → merchant → your cup

The Silence of the Warehouse

When imagining the world of tea, the warehouse is probably not the first image that comes to mind.

We prefer mountains, gardens, pickers, bamboo baskets, and large rooms where the leaves are worked.

Yet, after all this activity, comes a much quieter period.

The tea waits.

And during this wait, the job is precisely to ensure that as few undesirable things as possible happen.

Heat must remain controlled. Humidity must be kept at bay. Foreign odors must not penetrate the batches. Packaging must remain properly closed. References must remain identifiable.

In the case of certain teas intended for aging, the role of storage changes and the evolution becomes an integral part of the product. But this exception precisely confirms the importance of understanding what we wish to achieve.

A tea warehouse is therefore not just a place where boxes are stacked.

It is a space of transition between the producer's work and that of the merchant.

Making a great tea requires expertise. Preserving it then requires knowing how not to undo that work.

Documentation

Sources & verifications

• Dai et al. — Recommended storage temperature for green tea based on sensory quality — experimental study on the influence of storage temperature on the color, aromas, taste, and sensory quality of Huangshan Maofeng green tea.
• Impact of utilization of oxygen scavenger on aroma quality of Longjing tea during storage — study on the effect of temperature and oxygen reduction in packaging on the aromatic evolution of Longjing.
• Characterization and Quantitative Comparison of Key Aroma Volatiles in Fresh and 1-Year-Stored Keemun Black Tea — comparison of the main aromatic compounds of fresh Keemun and after one year of storage.
• Tea Board India — Tea Warehouse Control Order — institutional source regarding tea warehouses used notably for storage, auctions, blending, packaging, and export.
• Tea Board India — Revised Guidelines for Tea Warehouse License, 2026 — current institutional framework regarding tea warehouse licenses in India.