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Tea and Terps · Episode 6
Nik and Travis brew Oriental Beauty, a Taiwanese oolong that needs insects to bite it, and follow how a plant's chemistry becomes a flavor: what it makes, what processing changes, and what finally reaches the nose.
The cup
Oriental Beauty is a Taiwanese oolong made in summer from young shoots that tea green leafhoppers have fed on. Nik's cup is Tea Hong's Oriental Beauty Mystic from Hsinchu, made from the Qingxin Damao cultivar, and its silvery tips, the fine hairs of the young buds, are a mark of the style.
He calls it a tea that takes many sessions to know. What rises from the cup, what you taste and what lingers afterward are almost three different experiences, and the honey in the aroma was strong enough, he said, to cut with a knife.
What Nik noticed
Special notes
Leafhopper feeding and careful oxidation are central to Oriental Beauty’s character.
Oxidation is the cut apple browning that Nik described in Episode 5. Oriental Beauty is taken much further than most oolongs, yet it keeps fresh floral notes, which is the puzzle this episode sets out to explain.
Chapter by chapter
Press any time to play the episode from that moment. While it plays, the chapter you are in lights up.
The leafhopper
Most growers spend a season fighting sap-sucking insects. Oriental Beauty is made the other way around. In the Taiwanese summer, farmers hold off on sprays and let the tea green leafhopper feed on the young shoots, because the bitten leaves make a tea that unbitten leaves cannot.
The bite and the insect's saliva set off the leaf's defenses. Defense signals such as jasmonic acid and salicylic acid rise, the genes for making linalool become more active, and the leaf makes more of the floral compounds it produces in response to an attack. Then the maker takes over: the leaves are withered, oxidized almost as far as a black tea, fired and rolled again, and part of that chemistry is transformed into the honey and flower notes the tea is prized for.
the plant's response is to create these compounds that serve a defensive purpose.
Nik
Measured in tea under leafhopper feeding (Mei and colleagues, 2017; Qiao and colleagues, 2023). The signals and the linalool rise together; no single hormone switches it on.
Same molecule, different craft
Linalool is the floral note of lavender, and it turns up in both of this show's plants. In cannabis it is built and stored in the resin of the trichome heads, and the whole craft of drying and curing is about keeping it there: low heat, little light, gentle handling.
Oriental Beauty is treated in a way that would ruin cannabis flower. The leaves are bruised, oxidized almost to a black tea, fired in a pan, moistened and rolled again, and still the cup smells of fresh lavender and geranium. Much of a tea leaf's aroma is held in bound forms and made during processing, so for tea the processing is how the aroma is released. Nik's conclusion is that the setting a molecule sits in decides what processing does to it.
the molecular environment where a transformation can occur is almost a defining feature of the thing itself.
Nik
| What happens | In Oriental Beauty | In cannabis flower |
|---|---|---|
| Where it sits | In the leaf's cells, much of it bound or made after the bite | Ready-made in the resin of the trichome heads |
| Oxygen | More: Encouraged, deeply | Less: Kept away |
| Heat | More: Fired in a pan, then rolled again | Less: Kept low through drying and curing |
| What processing does | Releases and transforms the aroma | Protects what is already there |
Pigment to aroma
Preparing this episode led Nik to a thread that runs through the whole series: the pigment you see today may be the aroma you smell tomorrow. Beta-carotene, the orange pigment that sits under every green leaf's chlorophyll, can be cut by enzymes called carotenoid cleavage dioxygenases. In tea, particular versions of these enzymes have been shown to make beta-ionone, a small, fragrant piece that smells of violets.
Other cuts give other pieces. Some smell of roses or fruit; others act as signals. Beta-cyclocitral, formed when strong light damages beta-carotene, helps switch on a leaf's stress defenses, and the plant hormone abscisic acid is cut from carotenoids too. Beta-ionone has also been detected in cannabis flower, though how much of it forms during drying and curing is still an open question.
Tea's CsCCD enzymes and beta-ionone: Wang and colleagues, 2020. Beta-cyclocitral as a stress signal: Ramel and colleagues, 2012.
The green smell
Pinch a young bud in the third week of flower and the green, peppery smell you notice was not stored in a gland; it is made in the moment the cells break. Enzymes released from the damaged cells cut fatty acids from the membranes, and with oxygen they turn them into six-carbon aldehydes and alcohols, the compounds behind the smell of cut grass and green pepper.
People often call it the smell of chlorophyll, and Nik doubts it, rightly: chlorophyll does not evaporate, so it has no smell to give. What the nose catches is the breakdown of the lipids around it. It is the episode's first example of a bigger idea: a plant often produces its aroma rather than simply holding it in storage.
Real structures
Four molecules from the episode, rendered from real PubChem geometry rather than drawn. Pick one to read why it matters, then turn it in three dimensions.
A floral terpene alcohol, lavender's best-known note and one of the most widespread scents in plants. Tea leaves make more of it when leafhoppers bite; cannabis builds and stores it in the resin of its trichomes.
Structure data: PubChem open chemistry database
A thirteen-carbon fragment cut from beta-carotene, and the scent of violets. Tea has enzymes that make it, and it has been found in cannabis flower too.
Structure data: PubChem open chemistry database
The orange pigment under every leaf's green, and the parent of beta-ionone. Cut at a particular bond, the pigment gives a scented fragment.
Structure data: PubChem open chemistry database
The smell of cut grass, made within seconds when broken cells let enzymes and oxygen reach membrane fatty acids. It is the fresh green note of a pinched bud, not chlorophyll.
Structure data: PubChem open chemistry database
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Harvest timing
Most harvest calls are made through a loupe. Nik wonders how many growers also use their nose, because aroma ripens on its own schedule. Hops show how much timing matters: when Oregon State researchers picked Citra every week through the season, early cones smelled grassy and green-peppery, cones in the usual window carried the citrus, tropical and resinous notes brewers want, and late cones leaned toward onion and garlic. In one field, the shift happened within a single week.
Cannabis has its own version. The sulfur compounds behind its skunky note have been tracked rising late in flower, peaking around curing and fading in storage, so the smell at harvest does not stay fixed through the cure and storage. Whether a grower's nose can reliably time a harvest is still an open question, and Nik expects the answer to differ cultivar by cultivar.
aroma maturity, like you're suggesting, it's like a moving mixture.
Nik
Jobe and colleagues, 2025, with a trained smell panel. The shift was gradual in most fields.
Oswald and colleagues, 2021.
Small and loud
Terpene tests report what a flower contains by the percent: myrcene, limonene, linalool and the rest can add up to a few percent of its weight. Some of the loudest notes in the jar come from compounds millions of times scarcer. The sulfur compounds behind the skunky note sit at parts per billion, yet the nose picks them up so readily that they can dominate the impression.
They are also the shortest-lived: they appear late and fade early. Cold only slows them: even deep-frozen extracts keep changing over months. Nik keeps one Phoenix oolong in the fridge for the same reason, because its tropical notes turn toward onion and herbs within weeks at room temperature.
They're all produced in really small concentrations, but they are disproportionately loud on the nose.
Nik
| In a cannabis flower | Terpenes | Skunky sulfur compounds |
|---|---|---|
| How much is there | More: A few percent of the flower's weight | Less: Parts per billion |
| How much the nose needs | A noticeable amount | Less: Vanishingly little |
| How long they last | Through a good cure | Late to arrive, early to leave |
Moments worth rewinding
Moments from the clip archive. Each one plays the full episode from where it starts, and the short plays on its own.
Anji Bai Cha grows pale in spring because its chloroplasts are sensitive to cold. Short on chlorophyll, it stocks up on amino acids and drinks soft and pillowy.
Some Japanese producers roast the stems sorted out of green tea. Nik explains that stem tea carries less caffeine and fewer catechins than the leaf, so it drinks soft in the evening.
Wet, freshly cut flower keeps respiring, so how quickly it dries decides how much changes before the cure begins.
Thirty to forty-five days into a good cure, Nik has smelled notes that were not there before, as the molecules in the jar keep reacting.
One of Nik's Phoenix oolongs holds tropical-fruit sulfur compounds that fade toward onion and herbs at room temperature, so it stays cold.
Probably not. Chlorophyll does not evaporate; the green, metallic notes come from broken-down membrane lipids.
Travis passes on a tip for curing a whole room: vent when the CO2 meter climbs to about 800 ppm, and when it stops climbing back, the room has finished burping.
Even stored far below freezing, flower and extracts keep changing. Cold slows the chemistry; it does not stop it.
Keep listening
Episode 6 picks up the thread Episode 5 left, from what you see to what you smell.
Episode 7 · The next oneDrying, Curing, Concentrating and HojichaWhat happens to a harvest after the cut, from the drying room to rosin, over a roasted Japanese tea.
Episode 5 · The one beforePigments and GyokuroPigments and gyokuro: the colors of a leaf, from chlorophyll to anthocyanins.
Episode 1 · Where it beganCarbon and Fenghuang OolongCarbon, the element plants are built from, over a cup of Phoenix oolong.
