How tea is made: one leaf, six teas

By Phil · Published July 18, 2026 · Updated September 4, 2026

White, green, yellow, oolong, black, dark. They look and taste worlds apart, but almost all of them come from the leaves of a single plant, Camellia sinensis. There is no white-tea bush and no black-tea bush. The same fresh leaf becomes any of the six depending entirely on what happens to it after picking. If that still sounds implausible, the reference pages take it apart properly in is it really all one plant?

So the interesting question is not "what plant is this from" but "what did the maker do to it and in what order." Pick a tea below and trace its path. The steps it goes through light up, the ones it skips fade out.

The two variables that change everything

If you only remember one thing, make it this: the difference between the tea types is mostly a question of oxidation. Heat is how a maker controls it.

The honest version has a step in front of it. Plucking comes first and it is the only operation whose decisions cannot be walked back later. Which shoot is taken, at what maturity and in which season fixes the chemistry every later step has to work with. Oxidation is the biggest lever after that one, not instead of it.

When you tear a leaf and leave it exposed, the leaf's own enzymes react with oxygen and it browns, exactly like a cut apple going from pale to tan. In tea this drives the flavour from fresh and grassy toward fruity, malty, sweet and dark. Left alone, a bruised leaf will oxidise a long way.

To stop it, you heat the leaf. A blast of steam, a hot wok or an oven denatures the enzymes and holds the leaf roughly where it is. Tea people call this kill-green, shaqing, or fixing. The single most useful lens on the whole system is: when, if ever, does the maker apply that heat?

• Green and yellow are killed green early, before oxidation gets going, so they stay green.
• Oolong is killed green mid-way, after the leaf has partly oxidised, anywhere from lightly to heavily.
• Black gets no early kill-green at all. It oxidises all the way and the only heat arrives at the very end, during drying.
• White gets no separate kill-green either. It just withers and dries, oxidising gently throughout, with the final drying doing the halting almost as an afterthought.
• Dark tea is killed green early and properly, usually pan-fired. What makes it dark happens much later and it is not enzymes.

Whether that heat arrives as steam or as a hot pan is itself audible in the cup, which is the subject of steamed or pan-fired?

Once you see the timing of the kill-green, the six teas stop being a list to memorise and become a single spectrum.

Eight lanes in the diagram, twelve steps in the tea

The diagram above draws eight lanes, because eight is about what fits on a phone screen while still reading as a sequence. The reference tier splits the same process into twelve operations and the extra four are not padding. Plucking sets the ceiling. Roasting is a separate craft applied to finished tea, often by the merchant rather than the farm. Wet-piling and aging are two genuinely different mechanisms that the diagram has to squash into one "curing" lane. Sorting is what decides the grade on the box.

Where the tidy diagram lies a little

A clean top-to-bottom chart is a teaching tool, not a factory manual. A few honest caveats:

• The steps overlap and repeat. Bruising and shaping are usually the same physical act: a black tea's rolling breaks the cells and twists the leaf in one pass. Oolong's bruising and oxidation are not one pass but hours of repeated tossing and resting. Longjing green tea is shaped, fixed and dried in the same wok. Yellow tea's sweltering is often done more than once.
• Withering and oxidation are one process with a change of name. The moment the leaf starts losing water its cell walls begin to fail and enzymatic oxidation starts with them. The line gets drawn where the maker begins deliberately damaging the leaf to speed things up.
• The kill-green is a brake, not a wall. Heat brings oxidation nearly to a stop without ending it. Above the halting temperature the reaction keeps creeping and drying slows it further without ever closing it.
• White tea is not unprocessed. Because nothing ever deliberately halts it, white commonly reaches meaningful oxidation and keeps changing for years in storage. Least handled is not the same as untouched, which is white tea unprocessed? works through in more detail.
• Yellowing is not oxidation. By the time yellow tea is sweltered (men huang), its enzymes are already dead. The mellowing that follows is a slow, warm, non-enzymatic change, closer to a gentle stewing than to the browning of a cut apple.

Sheng and shou: not the same tea

Dark tea, hei cha, is the one place where a single box hides two genuinely different processes and it is the mistake a knowledgeable drinker will notice first. Both start the same way: withered, pan-fired to kill the green, rolled, then sun-dried into what the trade calls maocha.

Shou (ripe) pu'er then goes through wo dui, wet-piling: the maker heaps the damp leaf, keeps it warm and covered then lets microorganisms work through it for weeks before it is ever sold. This is the one operation in tea where fermentation is the accurate word.

Sheng (raw) pu'er skips the pile entirely. It is pressed and then aged, slowly, in storage, for years or decades, changed by air, humidity and time rather than by anything the maker does. Many drinkers argue that young sheng has more in common with a green tea than with shou. Presenting them as one dark-tea path is a convenience, not the truth: they are two branches that only look alike on paper. Raw or ripe puerh? is the page for picking between them.

Two naming traps worth knowing

English and Chinese disagree about the word "black."

• What English calls black tea is 红茶 (hong cha, literally "red tea"): the fully oxidised type in the diagram above.
• What Chinese calls 黑茶 (hei cha, literally "black tea") is the dark, fermented category: pu'er and friends.

Same two words, two different teas. When a vendor or a Chinese label says "black tea," it is worth a second to check which one they mean.

The second trap is smaller but more common on shelves. "Fired" turns up at both ends of a tea's making: it can mean the pan that killed the green at the start, or a roast applied to finished leaf months later. A label almost never says which end it means. What does fired mean on a label? gives the short version.

One last piece of vocabulary, because it is the most common error in tea writing: what happens to a black tea is oxidation, not fermentation. The two words get used interchangeably in print, sometimes in the same shop, but the distinction is worth holding because it predicts behaviour. An oxidised tea is finished when the maker stops it. A fermented one keeps changing. Oxidation or fermentation? settles which word goes where.

If you want the full reference rather than the tour, all twelve operations live in the processing section of the encyclopedia.