No. 030 — The Aromas of Tea

TSURU COLLECTION • ARTICLE 030

The aromas of tea

16 to 19 min read • Level: discovery & deepening • Cap sur le Thé

You open a package of plain tea. No fruit in the composition. No flower. No added aroma. Yet, your nose seems to recognize a peach, an orchid, honey, fresh grass, wood, citrus, or even a roasted hazelnut. How can a simple leaf of Camellia sinensis evoke so many things that are not found in the bag?

“A peach aroma in a tea does not mean that it contains peach. It tells what the leaf, its processing and our perception are capable of producing together.”

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Even before the first sip,
part of the tea is already telling its story through the nose.

Taste and aroma are not the same thing

We often use the word “taste” to talk about everything we perceive when we drink.

Yet, our experience of a cup brings together several phenomena.

The tongue notably participates in the perception of major taste dimensions such as sweet, sour, bitter, salty and umami.

Astringency, on the other hand, corresponds more to a tactile sensation: this impression of dryness or tightening that some teas cause in the mouth.

Aroma is mainly related to olfaction.

Before drinking, sufficiently volatile molecules leave the tea and reach your nose through the air. This is what is called orthonasal olfaction.

When you drink, other aromatic molecules released in your mouth travel up to the nasal cavity. This is then called retronasal olfaction.

This is one of the reasons why an infusion can seem relatively discreet when you smell it in its cup and then become surprisingly expressive once in the mouth.

The final perception that we commonly call “flavor” therefore comes from a combination.

Taste is part of it.

Smell too.

Temperature plays a role.

Texture plays a role.

Astringency, sweetness, bitterness and length on the palate also contribute to the whole.

Understanding the aromas of tea therefore begins with this distinction: your nose does much more work than you imagine when you taste.

The fresh leaf already has an aromatic world

It all starts before manufacturing.

A fresh tea leaf is not chemically neutral.

It already contains volatile molecules, but also many substances likely to become aromatic compounds during the operations that follow the harvest.

Researchers speak notably of several major formation pathways involving the leaf's lipids, certain amino acids, carotenoids and compounds present in linked forms, notably glycosides.

These terms may seem very far from your cup.

Yet, they allow us to understand a fundamental principle: a large part of the fragrance of a finished tea is not necessarily found as such in the leaf at the time of picking.

The leaf rather has a kind of aromatic potential.

The harvest and then the manufacturing will release certain molecules, transform others, make some disappear and create new ones.

This is where tea becomes fascinating.

The same plant species can give rise to very different sensory universes because producers do not activate the same transformation mechanisms.

The compounds called “green leaf volatiles” participate, for example, in fresh, green or herbaceous sensations. Certain terpenes, including linalool or geraniol, are associated in many studies with floral or fruity dimensions.

But beware of a tempting simplification.

It would be wrong to imagine that a molecule automatically equates to a perfectly identifiable fragrance.

A tea contains very many compounds.

They do not all have the same perception threshold.

They interact.

Some are present in large quantities but contribute relatively little to the smell because our nose is not very sensitive to them.

Others can exert a notable influence at much lower concentrations.

The final fragrance of a tea is therefore that of an ensemble, not that of an isolated molecule.

The cultivar gives a first direction

All tea plants belong to the same species when it comes to real tea: Camellia sinensis.

But there are many cultivars.

A cultivar is a lineage selected and multiplied to preserve certain desired characteristics.

These genetic differences can influence the chemical composition of the leaf and therefore its aromatic potential.

Two cultivars grown side by side and processed in a comparable way will not necessarily produce two identical cups.

Some may prove particularly suited to floral profiles.

Others may offer a more vegetal, fruitier, more structured or softer expression.

However, one must still maintain a certain caution.

The cultivar never works alone.

A variety renowned for a particular aromatic profile can produce very different results depending on the season, the condition of the harvested leaves and especially the work carried out after picking.

To say that a cultivar has a potential is therefore not to state that it will always produce exactly the same fragrance.

It provides a material.

The manufacturing gives it a direction.

The place and the season matter, but do not tell everything

The word “terroir” is sometimes used as if it alone explained the taste of a tea.

The reality is more complex.

Climate, temperature, sunlight, rainfall, altitude, soil nature and farming practices can influence the development of the plant and its composition.

The harvest season can also change the chemical balances of the leaf.

But it would be imprudent to automatically attribute a precise aroma to an isolated factor.

A floral note does not prove an altitude.

A mineral impression does not allow, on its own, to identify a soil.

A fruity smell does not allow to find a region with certainty on a map.

Tea is the result of interactions between the plant, its environment, the harvest period and human work.

This is why tasting can provide clues, sometimes extremely interesting, but it does not constitute a laboratory capable of reconstructing the entire history of a leaf with certainty.

This distinction precisely protects what makes tea exciting: its complexity is not reduced to a single cause.

The manufacturing transforms the fragrance

Imagine now a fresh leaf that has just been harvested.

It already contains its potential.

But it is during the manufacturing that a large part of its aromatic identity will become clearer.

Withering, rolling or bruising, rolling, heat fixation, oxidation, drying and roasting do not only have the function of giving a shape to the leaf.

These operations change its chemistry.

When the tissues of the leaf are wounded or rolled, cellular compartments that were separated can come into contact. Enzymes then meet their substrates and certain reactions become possible.

In black teas, rolling and enzymatic oxidation thus play a major role in the evolution of many constituents.

In green teas, heat fixation intervenes much earlier in order to quickly inactivate the enzymes responsible for enzymatic oxidation.

This step is however not neutral on the aromatic level.

Heat itself can transform the profile of the volatile compounds and their precursors.

Research on green teas moreover shows that fixation, cooking and drying can deeply remodel their volatile profile.

A green tea heated in a vat, a green tea treated with steam and a strongly roasted green tea therefore do not follow exactly the same aromatic path.

This leads us to an essential idea: a tea's family is not only a color; it is a way of conducting the transformations of the leaf.

The harvested leaf has a potential.
The manufacturing chooses largely how this potential will express itself.

Why does rolling change something?

Rolling sometimes seems to be only a matter of shape.

One imagines that the producer rolls the leaves only to obtain a needle, a twist or a small ball.

That would be forgetting what happens inside.

When rolling exerts a pressure on the tissues, it changes the integrity of the cells.

In certain manufacturing, this action facilitates the contact between different constituents of the leaf and promotes the reactions that will then participate in the aromatic profile.

Recent studies on black tea have observed measurable changes in the profile of volatile compounds during rolling.

The producer's gesture is therefore not only aesthetic.

It intervenes in the construction of the cup.

The duration, the intensity and the degree of bruising become as many possible parameters.

This is why two manufacturers working a similar raw material can result in very different expressions.

Heat can make appear another landscape

Then comes the heat.

It can stop certain enzymatic reactions.

It can also trigger others.

During sufficiently marked thermal treatments, chemical reactions contribute to evolve the fragrance towards roasted, toasted, cooked or roasted universes.

Some fragile volatile molecules disappear partly under the effect of the temperature.

Others are formed.

Precursors are transformed.

The result depends on both the temperature, the time and the condition of the leaf at the moment it is heated.

This is why roasting does not just “add a roasted taste”.

It recomposes a much broader balance.

A mastered heating can make appear impressions of nuts, cereals, grilled bread or caramel.

But these words remain sensory descriptors.

There is not necessarily a hazelnut, bread or caramel in the tea.

Your brain simply recognizes similarities between what the leaf produces and smells it already knows.

“Floral”, “fruity”, “honeyed”: what are we really talking about?

A tasting vocabulary is not a chemical photograph of the tea.

It is a language.

When several tasters talk about a rose note, they do not necessarily say that they have identified a precise molecule and measured its concentration.

They say that the whole of the sensations evokes for them something belonging to the universe of the rose.

This mechanism rests on the olfactory memory.

We continually compare new smells to those we have already encountered.

This is also the reason why two people can describe differently the same cup without one necessarily being “bad” at tasting.

One will say peach.

The other apricot.

A third will simply speak of ripe yellow fruit.

These three descriptions may belong to the same sensory space.

Vocabulary depends on experience, culture, memory, and the foods each person knows.

Nevertheless, there is a difference between freedom and absolute fantasy.

A descriptor becomes truly useful when it helps communicate a reproducible sensation.

The goal, therefore, is not to seek the most spectacular word.

It is to find the one that allows you to rediscover the cup.

Naturally aromatic is not synonymous with flavored

This is probably the most important distinction of this Tsuru.

A plain tea can be extremely aromatic.

It can evoke flowers, fruits, or spices even though its composition contains only tea.

These sensations then come from the natural profile of the leaf and the transformations caused by its manufacture.

A scented or flavored tea follows a different logic.

Its profile has been deliberately enriched by an external substance: flowers brought into contact with the tea, zest, fruits, plants, spices, essential oil, extract, flavoring preparation, or a combination of several methods.

We dedicated Tsuru No. 024 to scented tea precisely to this second family.

The two phenomena should therefore not be confused.

A note of jasmine in a plain tea does not prove the addition of jasmine.

Conversely, a tea that actually contains jasmine is indeed the result of a different intervention on its aromatic profile.

Water does not create aromas, but it decides what you will encounter

The tea is finally made.

It has its profile.

But your cup is not yet written.

There is still the infusion.

Water extracts different substances from the leaf, and heat also promotes the release of many volatile compounds.

The water temperature, the infusion time, the amount of leaves, and the ratio of water to tea will therefore change the balance you perceive.

An infusion that is too short can leave certain dimensions discreet.

An excessively long infusion can, on the contrary, increase the extraction of compounds responsible for bitterness or astringency to the point that they dominate the experience.

Temperature also plays a dual role.

It influences extraction, but it also influences the volatility of aromatic molecules.

A very hot cup can intensely release certain aromas while being difficult to analyze precisely because the heat itself hinders the tasting.

As the tea cools, the perceived profile can change.

Certain notes become less obvious.

Others appear with greater clarity.

This is why an interesting tea often deserves to be tasted at several temperatures.

The Tsuru dedicated to temperature and infusion time allows you to deepen this role of preparation.

Why does the empty cup sometimes smell so good?

Here is a surprisingly simple experiment.

Finish your tea.

Wait a few moments.

Then smell the empty cup.

You will sometimes discover a much clearer scent than when the cup was full.

Sweet, floral, fruity, or roasted notes can remain clinging to the porcelain and become particularly easy to observe.

This phenomenon is valuable for tasting because it removes part of the sensory noise caused by the heat and by the liquor itself.

The empty cup becomes almost a second analysis instrument.

The wet leaves constitute a third field of observation.

Smell them when the infusion is finished.

Their profile often differs markedly from the dry leaves.

You then have three successive aromatic photographs:

the dry leaf, the infusion, and the wet leaf.

A great number of details go unnoticed when you simply drink quickly.

The aroma continues to evolve after manufacture

A finished tea is not necessarily a chemically immobile object.

Over time, its profile can evolve.

Oxygen, heat, light, humidity, and surrounding odors are capable of altering its quality.

Some volatile compounds can dissipate.

Others can evolve through oxidation.

The result can be a loss of freshness, a weakening of certain notes, or the appearance of a duller character.

This explains why the fragrance of a fresh green tea can gradually lose its brilliance when poorly stored.

The sealing of the container therefore becomes essential.

But there is an important nuance.

Not all teas are necessarily designed to remain identical.

Some dark teas, notably certain Pu-erhs, can be deliberately stored so that their profile evolves over time under suitable conditions.

You should therefore not confuse controlled aging with degradation caused by poor storage.

For teas intended to retain their freshness, you can return to the Tsuru No. 017 dedicated to the freshness and storage of tea.

Do you need to know the names of the molecules to taste well?

No.

Knowing linalool, geraniol, hexanal, certain ionones, or other volatile compounds allows you to understand the chemistry behind the sensations.

But tasting is not an analytical chemistry exam.

Your goal is not to look at a cup and announce a list of invisible molecules.

Science explains the mechanisms.

Tasting observes the result.

The two approaches can meet without being confused.

A taster can become extremely precise without knowing the name of each molecule.

Conversely, perfectly knowing a chromatographic analysis does not guarantee that you will describe a cup with elegance and accuracy.

What matters for the enthusiast is to gradually build their sensory memory.

Compare.

Return to the same teas.

Taste them at different temperatures.

Smell the dry and wet leaves.

Try to distinguish large families first before seeking extremely precise words.

Vegetal.

Floral.

Fruity.

Woody.

Spicy.

Roasted.

Gourmand.

Then refine only if an association seems obvious to you.

You can also revisit the Tsuru No. 014 dedicated to the tasting of tea to organize this observation.

So, where do the aromas of tea come from?

They do not come from a single place.

They begin in the plant.

The cultivar brings its genetic heritage.

The environment and the season influence the development of the leaf.

The harvest chooses the material that will enter the workshop.

Then manufacture begins its work.

The leaf is withered.

It is sometimes rolled or bruised.

Certain enzymatic reactions are promoted while others are stopped.

Heat further transforms the balance.

Drying stabilizes the product while also contributing to the final profile.

Storage can then preserve or alter this result.

Finally, water extracts the leaf and your own sensory system interprets what it receives.

This is why the aroma of tea is neither a commercial invention nor a simple list of fruits and flowers.

It is the sensory translation of an extremely complex story.

A biological story.

A chemical story.

An agricultural story.

A human story.

And finally a personal story, because your memory may decide to call what another taster calls “apricot” “white peach.”

The most important thing, therefore, is not to seek the perfect word.

It is to learn to listen to the leaf.

Because a plain tea needs no fruit to evoke a fruit, no flower to recall a flower, and no hazelnut to bring forth the idea of a hazelnut.

It sometimes only needs to have encountered the right cultivar, the right harvest, the right gesture, the right heat, and the right water.

A leaf.
Hundreds of molecules.
And sometimes the memory of a fruit that was never there.

The next time a tea reminds you of a flower, a peach, or a hazelnut, do not just ask “what is in it?”. Also ask: “what happened to this leaf?”

© 2026 Cap sur le Thé — Tsuru Collection No. 030.
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