How Darjeeling Tea Is Made

From the Tea Bush to the Factory

Tea is made from the leaves and buds of the tea plant, Camellia sinensis. In Darjeeling, plucking is generally selective, with the tender shoot consisting of two leaves and a bud forming the familiar standard for many premium teas.

The quality of the freshly plucked leaf is important. Leaves that are damaged, bruised, coarse or poorly handled can affect the finished tea. They are therefore collected carefully and transported to the factory, where processing begins.

The time between plucking and processing, the condition of the leaf, and the way it is handled during the early stages all influence the result. Tea manufacture is not simply a matter of drying leaves. It is a sequence of physical and biochemical changes, controlled by the tea maker.

The Main Stages of Tea Processing

Different styles of tea follow different combinations of processing steps. Black tea, for example, undergoes substantial oxidation, while green tea is heated early in the process to prevent it. Before looking at the individual styles, it is useful to understand the main operations involved.

1. Withering

Freshly plucked tea leaves contain a high proportion of moisture. They are spread out on long, shallow troughs, usually fitted with mesh beds and fans that circulate air through the leaves.

During withering, the leaves gradually lose moisture and become soft and pliable. This makes them easier to roll without breaking into unwanted fragments. Withering also initiates biochemical changes within the leaf that contribute to the development of aroma and flavour.

The duration depends on the condition of the incoming leaf, the temperature and humidity of the factory, the airflow and the type of tea being manufactured. It may take several hours and, in orthodox black tea manufacture, can extend to well over half a day.

Withering is not merely a drying operation. It is an important stage in determining the character of the finished tea.

2. Rolling

After withering, the leaves are passed through rolling machines. In orthodox manufacture, the purpose is to twist the leaves and break open some of their cells without completely destroying their structure.

When the cells are broken, their contents come into contact with oxygen and the enzymes naturally present in the leaf. This makes the next stage, oxidation, possible.

The extent and intensity of rolling influence the rate and uniformity of oxidation. The tea maker must balance sufficient cell disruption with the need to retain the leaf’s shape and avoid excessive damage.

In some factories, the rolled leaf is passed through roll-breakers and sifters to separate the particles and prepare them for the next stage.

3. Oxidation

Oxidation is one of the most important processes in the manufacture of tea. It is responsible for many of the differences between black, oolong and green tea.

When the cells of a tea leaf are disrupted, naturally occurring enzymes come into contact with compounds known as catechins, which are part of the leaf’s polyphenols. In the presence of oxygen, enzymatic reactions transform these compounds into other substances, including theaflavins and thearubigins.

These changes influence the colour, aroma, taste and mouthfeel of the tea. The leaf gradually changes from green towards coppery or brown shades, depending on the extent of oxidation.

The term fermentation is often used in the tea industry to describe this stage. However, in conventional black tea manufacture, the process is primarily enzymatic oxidation rather than microbial fermentation.

Oxidation is controlled by factors such as temperature, humidity, the thickness of the spread leaf, airflow and the condition of the rolled material. The tea maker decides when the leaf has reached the desired stage and should proceed to drying.

4. Drying or Firing

Once the desired level of oxidation has been reached, the tea is passed through a dryer. Hot air removes the remaining moisture and brings the biochemical activity responsible for oxidation to a halt.

This stage is often called firing. The temperature, duration and airflow must be carefully managed. Excessive heat can damage delicate aromas, while insufficient drying can leave too much moisture in the finished tea and affect its keeping quality.

Finished tea is generally dried to a low moisture content, commonly around 3–4%, so that it can be stored and transported safely.

5. Sorting and Grading

After drying, the tea is passed through sieves and sorting equipment to separate it according to the size and shape of the particles.

Orthodox black tea is commonly classified into grades such as whole leaf, broken leaf, fannings and dust. Some familiar grade descriptions include:

• Whole leaf: Larger, relatively intact leaves.

• Broken leaf: Smaller pieces of leaf produced during processing.

• Fannings: Fine particles smaller than broken-leaf grades.

• Dust: Very small tea particles, generally used for quick-brewing teas.

These are classifications based mainly on particle size and appearance. They should not be confused with the overall quality of the tea. A whole-leaf tea is not automatically superior to every broken-leaf tea; the quality of the raw leaf, manufacture and cup character remain important.

After sorting, the tea is packed in suitable moisture-resistant packaging to protect it from humidity, light and unwanted odours.

Types of Darjeeling Tea by Processing Style

Although Darjeeling is best known for its orthodox black tea, the region produces several other styles. The principal difference between them is the way the fresh leaf is treated, particularly whether oxidation is prevented, allowed to develop partially or allowed to proceed extensively.

1. Orthodox Black Tea

<emphasis>Extensive oxidation | Withering, rolling, oxidation and drying</emphasis>

Orthodox black tea is the traditional and most widely recognised style of Darjeeling tea. It is manufactured through a sequence of withering, rolling, oxidation and drying, with careful attention to the handling of the leaf at each stage.

The leaves are first withered to reduce moisture and make them pliable. They are then rolled to twist the leaf and break its cells. This exposes the leaf’s natural compounds to oxygen and allows oxidation to develop.

The extent of oxidation is carefully judged by the tea maker. Once the desired character has developed, the leaves are dried to stop further oxidation and stabilise the tea.

Darjeeling black tea is known for its relatively delicate body, briskness and complex aroma. Depending on the material and manufacture, the cup may show floral, fruity, sweet, woody or muscatel-like characteristics. It is often lighter and more aromatic than the strong, dark liquor associated with many Indian CTC teas.

Orthodox manufacture also preserves much of the original leaf structure. The finished tea therefore consists of recognisable twisted leaves rather than the small, uniform granules associated with CTC manufacture.

2. Green Tea

<emphasis>Minimal oxidation | Heat fixation, rolling and drying</emphasis>

Green tea is manufactured in a way that prevents substantial enzymatic oxidation. The most important step is the early application of heat, known as fixation.

Fresh leaves are heated soon after plucking, commonly through steaming or pan-firing. This inactivates the enzymes responsible for oxidation and helps preserve the leaf’s green character.

The leaves are then rolled or shaped and dried. The precise sequence and degree of rolling vary according to the style being produced.

Because oxidation is largely prevented, green tea retains a different chemical and sensory character from black tea. It generally produces a lighter-coloured liquor, with vegetal, fresh, grassy or sometimes nutty notes. The flavour depends on the leaf material and the particular method of heating and drying.

Darjeeling green tea can be delicate and aromatic. Its character is not necessarily the same as that of Japanese steamed green tea or the pan-fired green teas produced in China, since the methods and local manufacturing practices differ.

3. White Tea

<emphasis>Very little processing | Withering and drying, with minimal leaf disturbance</emphasis>

White tea is among the least processed styles of tea. Its manufacture generally involves careful plucking, gentle handling, withering and drying, with little or no rolling.

The aim is to preserve the natural appearance and delicate character of the leaf. The leaves are spread out to lose moisture gradually and are then dried. Unlike green tea, white tea is not necessarily subjected to an early fixation step. Some natural oxidation may occur during withering, but it is generally limited by the gentle handling and drying process.

White tea is often made using tender buds and young leaves, sometimes with the fine silvery hairs still visible on the buds. The finished tea can have a pale appearance and a delicate, subtle flavour, sometimes with notes of flowers, honey or fresh fruit.

The absence of extensive rolling and oxidation means that the leaf remains much closer to its original form. However, white tea is not simply fresh tea leaves that have been dried in the sun. The quality of the plucking, the withering conditions and the drying technique all require considerable care.

4. Oolong Tea

<emphasis>Partial oxidation | Withering, controlled bruising or rolling, partial oxidation and drying</emphasis>

Oolong occupies a position between green and black tea in terms of oxidation. It is often described as partially oxidised tea, although the actual degree of oxidation varies considerably between different oolong styles.

The leaves are first withered. They are then gently bruised, shaken or rolled to damage selected areas of the leaf and encourage oxidation. The extent of this treatment, together with the duration and conditions of oxidation, determines the character of the finished tea.

When the desired stage is reached, heat is applied to inactivate the enzymes and stop further oxidation. The tea is then rolled or shaped as required and dried.

Oolong teas can vary from lightly oxidised styles with fresh, floral characteristics to more extensively oxidised teas with richer, fruitier and sometimes roasted notes. Darjeeling oolongs are generally appreciated for their fragrant aroma, smooth character and balance between the freshness associated with green tea and the depth of black tea.

The precise manufacturing sequence can differ between gardens and individual batches. Oolong is therefore not a single fixed recipe but a broad family of teas made through controlled partial oxidation.

Understanding Oxidation: What Makes the Different Styles?

The level of oxidation is one of the principal factors that distinguishes the major styles of tea. It is useful to think of the process as a spectrum rather than four completely separate categories.

<emphasis>Approximate processing distinction</emphasis>

These descriptions are broad categories, not precise numerical measurements. There is no single oxidation percentage that applies to every green, white, oolong or black tea. Actual manufacture depends on the style, the condition of the leaf and the decisions made by the tea maker.

Oxidation should also not be confused with roasting. Oxidation is a biochemical process involving enzymes and oxygen. Roasting or firing involves the application of heat and may be used during or after other stages of manufacture, depending on the tea style.

Orthodox Tea and CTC: Two Different Manufacturing Methods

The terms orthodox and CTC describe different methods of processing tea. They are not separate levels of quality, nor do they refer to the flush or season in which the tea was plucked.

Orthodox Manufacture

In orthodox manufacture, the withered leaves are rolled to twist them and break their cells while retaining much of their original structure. The resulting tea generally has larger, more recognisable leaf particles.

The method allows the tea maker to control the degree of leaf disruption and oxidation. It is particularly suited to the manufacture of speciality loose-leaf teas, where aroma, flavour and the character of the leaf are important.

Darjeeling is strongly associated with orthodox manufacture. Its reputation for delicate and aromatic tea is closely connected with this approach.

CTC Manufacture

CTC stands for Crush, Tear and Curl. In this method, withered leaves pass through a series of specially designed rollers that crush, tear and curl them into small, uniform particles.

The greater disruption of the leaf structure allows oxidation to develop rapidly. The finished tea is granular and brews relatively quickly, producing a strong, dark liquor.

CTC tea is widely used for everyday tea consumption in India, particularly where a strong brew is preferred. It is not the traditional style associated with premium Darjeeling tea, although the distinction is primarily one of manufacturing method rather than an absolute statement about quality.

What Makes Darjeeling Tea Different?

The processing method is only part of the explanation. Darjeeling tea owes its distinctive character to the interaction between the tea plant, the growing environment and the skill involved in manufacturing the leaves.

The Mountain Environment

The tea gardens of Darjeeling are spread across the Himalayan foothills, at elevations that vary considerably from one estate to another. The slopes, temperature patterns, rainfall, humidity, cloud cover and drainage conditions all influence the way tea bushes grow.

Compared with many lower-elevation tea-growing regions, the cooler mountain environment can result in slower leaf development. This affects the composition of the fresh leaf and contributes to the character of the finished tea.

The growing conditions are not identical across all Darjeeling gardens. Differences in elevation, aspect, soil, shade and local weather can produce noticeable variations between estates.

The Tea Plant and Its Varieties

The tea plant belongs to the species Camellia sinensis. Within the species, different varieties, cultivars and clones are cultivated in tea gardens.

Darjeeling has a long association with Chinese-type tea plants, alongside other planting material introduced and developed over time. The choice of plant material influences leaf characteristics, growth patterns and the chemical composition of the shoots.

The variety of the plant is one reason why teas from different gardens can have distinct characteristics even when grown in the same broad geographical region.

Leaf Chemistry and Aroma

Fresh tea leaves contain a complex mixture of compounds, including catechins, amino acids, sugars, caffeine, pigments and aromatic precursors.

During processing, some of these compounds are transformed, while others contribute directly or indirectly to the aroma and taste of the finished tea.

Oxidation is particularly important in black and oolong tea manufacture. The transformation of catechins produces compounds such as theaflavins and thearubigins, which influence colour, brightness, taste and mouthfeel.

Aroma is even more complex. Many volatile compounds contribute to the floral, fruity, sweet, woody and muscatel-like notes associated with different Darjeeling teas. Their development depends on the original leaf chemistry as well as withering, rolling, oxidation and drying.

This is why the skill of the tea maker matters. Processing is not simply a mechanical sequence; it involves judging the condition of the leaf and adjusting the treatment to achieve the desired result.

The Role of the Tea Maker

Two batches of leaves from the same garden may not behave in exactly the same way. Differences in moisture, maturity, weather conditions and leaf composition can affect the manufacturing process.

The tea maker must therefore adjust the withering, rolling, oxidation and drying stages according to the material being processed. Small changes can influence the final aroma, strength, briskness and texture.

The experience and judgement of the people working in the factory remain important, even where modern machinery is used.

The Importance of the Garden’s Identity

Darjeeling tea is closely associated with the individual estates where it is grown. The name of the garden is often an important part of the identity of a particular tea.

The geographical conditions, plant material, management practices and manufacturing decisions differ between estates. Consequently, teas from different gardens can have distinct personalities.

The name Darjeeling is therefore not simply a description of a particular flavour or processing method. It identifies tea associated with a defined geographical origin and the production requirements governing the use of that name.

More Than One Way to Experience Darjeeling Tea

A cup of Darjeeling tea is the result of a chain of decisions that begins in the garden and continues inside the factory. The choice of leaf, the way it is handled, the extent of oxidation and the method of drying all contribute to the final character.

Black, green, white and oolong teas demonstrate how different processing approaches can produce very different results from the same tea plant. Orthodox manufacture, in particular, has played a central role in establishing Darjeeling’s reputation for fine loose-leaf tea.

For visitors, understanding these processes adds another dimension to a visit to a tea garden. Beyond the familiar rows of bushes on the hillsides, there is a world of skilled work, careful observation and technical knowledge inside the factory.

A visit to Darjeeling’s tea country offers an opportunity to understand not only where the tea grows, but also how the fresh leaf is transformed into one of the region’s most recognised products.

Explore Darjeeling’s tea country with DarjeelingWalks

Discover the landscapes, people and traditions behind Darjeeling tea through a locally informed tea garden experience. To enquire about a tea garden walk or a personalised visit, contact us.

Phone / WhatsApp: 9733000590