The answer: one plant, six processes
All true tea comes from one plant, Camellia sinensis, and the six types - green, white, yellow, oolong, black, and dark (with pu-erh the famous example) - are defined by what the maker does to the leaf, not by the leaf's color and not by the plant variety. The master variable is oxidation, the enzymatic browning that begins when leaf cells break; the second variable is microbial fermentation, which continues after drying in the dark teas. Green tea halts oxidation before it starts by fixing the leaf with heat. White tea barely touches the leaf, withering and drying it. Oolong stops oxidation partway, black tea lets it run to completion, and dark tea adds a fermentation stage on top. Yellow tea, a lightly sealed variant of green processing, completes the set, though this desk does not currently list it. Learn the process and any tea can be placed on the map in seconds - including the misnamed ones.
The six types at a glance
| Type | Oxidation | Defining step | Desk lines | Brew reference |
|---|---|---|---|---|
| Green | None | Pan fixing or steaming right after pick | Longjing, sencha, jasmine base | 3 g per 150 ml, 80-85 C |
| White | Slight, ambient | Slow withering, then drying - no fixing | Silver Needle to Shoumei | 5 g per 150 ml, 85-90 C |
| Oolong | Partial | Bruising the leaf, then fixing partway | Tieguanyin, rock teas, Dancong | 7 g per 110 ml, 95-100 C |
| Black | Full | Rolling, then full oxidation before drying | Keemun, Dianhong, CTC | 3 g per 150 ml, 95-100 C |
| Dark | Then fermented | Microbial post-fermentation, pressed or loose | Raw and ripe pu-erh | 5-7 g per 110 ml, 100 C, rinse |
| Yellow | Minimal | A sealed, slow yellowing step after fixing | Not currently listed | As green tea |
The brew column is a starting reference, not law: within each type, leaf age and style move the numbers. What the table fixes is category logic - where a tea sits, and therefore how it will behave in storage, in service, and on a price list.
Why the classification matters commercially
Category placement is not academic; it drives four practical things. Customer expectations: a shopper who buys white tea expects a soft, downy cup, and a green tea wearing a white name breaks that promise at the first sip. Brewing instructions: each column has a working temperature band, and instructions from the wrong column ruin the tea. Storage advice: green tea wants cool, sealed freshness while dark tea wants to breathe - advice that crosses columns becomes nonsense. And catalog structure: a retail wall or a wholesale list organized by type reads instantly, while one organized by color or by name scatters related lines. Anji white tea is the standing example - a green tea by processing that must be listed, brewed, and stored as a green tea - and the desk's note on why Anji white tea is a green tea unpacks that case fully.
Oxidation versus fermentation
The two words describe different chemistry and get swapped constantly in trade talk. Oxidation is enzymatic browning inside the leaf: cells break, enzymes meet oxygen, and polyphenols transform - the same family of reactions that browns a cut apple. It runs within hours and is stopped by heat. Fermentation, in the tea sense, is microbial work done by cultures over weeks and years, as in a ripe pu-erh's wet piling or a raw cake's slow aging; heat stops it only sometimes, and time mostly feeds it. So black tea is fully oxidized, not fermented, and pu-erh is fermented, not merely oxidized - and a buyer who keeps the two straight will never be confused about where pu-erh belongs or why it behaves differently in storage. When in doubt on a spec sheet, ask which process the sheet describes; a serious supplier names the process, not just the color.
Where scented, blended, and grain teas fit
Three neighboring categories sit outside the six but borrow from it. Scented and flavored teas - jasmine green, lemon black - are one of the six types wearing additions, and the base column on the label tells you which behavior to expect; the desk's note on how scenting and flavoring work covers the methods. Roasted-grain teas such as barley tea contain no Camellia leaf at all and belong with the botanicals. Herbal and fruit blends - chamomile, mint, rose, dried fruit - are infusions, not teas in the processor's sense, and their natural home on a menu is the caffeine-free wing, where the desk keeps those lines organized. Buyers who keep these boundaries tidy on their own catalogs answer most customer questions before they are asked, and avoid the classic listing error of shelving a green tea under white because its name said so.
Choosing by program, not by type
Types are the map; programs are the journey. A bubble tea brand starts from a strong black or CTC base plus jasmine and matcha. A hotel builds from easy, forgiving formats - pyramid bags of black and gentle greens with one herbal for the evening. A retail wall needs breadth across all the columns so every customer question has an aisle. A gifting program leans on white teas and pressed pu-erh for weight and ceremony. A tea house goes deep on oolong and dark tea, where re-steeping and vintage reward attention. The desk's solution pages match audiences to lines this way, and the common pattern is that nobody needs all six types equally - they need two or three columns done well, with one extension line for range. Choosing that core from the map above takes minutes; choosing it from a hundred product names takes weeks.
Seasonality and the buying calendar
The columns differ in when they are made, and that shapes when they should be bought. Green and white teas concentrate in spring - Anji's pale window and the pre-Qingming green rush are weeks long - so programs that want first-pick material book ahead. Oolongs arrive in spring and autumn crops, with rock teas reaching their best after months of roasting rest. Blacks and CTC trade closer to year-round supply, and ripe pu-erh is pressed on cycles that make it the most available category of all. The desk's buying calendar note lays the year out month by month, and the practical rule holds across all of them: seasonal columns reward buyers who plan before the harvest, and stable columns reward buyers who lock blend sheets instead. When the map and the calendar are both in view, start from the hub that matches your core column - the green tea hub and black tea hub carry the full lines - and send the quote form your program for a written sample plan.