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Every tea — green, black, white, oolong, pu-erh — starts as a fresh leaf from the same plant: Camellia sinensis. The differences between tea types are created entirely by what happens after picking. The sequence of withering, heating, rolling, oxidizing, and drying determines whether a batch of fresh leaves becomes a delicate white tea or a bold black tea.
Camellia sinensis is an evergreen shrub native to East Asia. Two main varieties are cultivated worldwide.
Camellia sinensis var. sinensis: The Chinese variety. Smaller leaves, more cold-hardy, and better suited to producing green, white, and oolong teas. Grown in China, Taiwan, Japan, and at higher elevations in countries like Nepal and India (Darjeeling).
Camellia sinensis var. assamica: The Assam variety. Larger leaves, more vigorous growth, and higher in tannins. Predominantly used for black tea production. Grown in Assam, Sri Lanka, Kenya, and other tropical regions.
Tea plants are kept as waist-height bushes through regular pruning, but left unpruned they can grow into trees 15 meters tall. The best tea is typically made from the youngest growth — the bud and first two leaves at the tip of each branch.
Picking determines quality from the start. The "two leaves and a bud" standard is the benchmark for premium tea. Larger, coarser leaves produce rougher, less complex tea.
Hand-picking allows selective harvesting of only the youngest, most tender growth. Machine harvesting is faster but less discriminating — it collects everything at a uniform height, including older leaves and stems.
Season matters too. Spring harvests (first flush) typically produce the most delicate, complex teas. Summer harvests are bolder. Autumn harvests are mellower.
Fresh tea leaves contain about 75% water. Withering reduces this to 55-65% by spreading the leaves on troughs or racks and allowing moisture to evaporate, either naturally (outdoors or in well-ventilated rooms) or with the aid of fans and warm air.
Withering softens the leaves, making them pliable enough to roll without shattering. It also begins chemical changes — chlorophyll starts breaking down and aromatic compounds begin to develop.
White tea may be withered for 24-72 hours. Black tea withering typically takes 12-18 hours.
Fixing stops oxidation by deactivating the leaf enzymes with heat. This is the step that defines green tea — it happens immediately after withering (or even instead of withering for some Japanese greens).
In China, fixing is typically done by pan-firing: tossing the leaves in a hot wok or drum at 200-300°C. In Japan, the leaves are steamed for 30-120 seconds. These two methods create the fundamental divide between Chinese and Japanese green tea styles.
Black tea skips this step entirely, or delays it until after full oxidation. Oolong tea applies it partway through oxidation.
Rolling shapes the leaf and breaks cell walls, which releases juices and enzymes that drive oxidation and flavor development.
For green tea, rolling after fixing simply shapes the leaf (flat, curled, or pellet-shaped) without triggering further oxidation, since the enzymes are already deactivated.
For black and oolong teas, rolling before or during oxidation is critical — the cell damage from rolling is what enables the oxidation process.
Rolling can be done by hand (traditional) or by machine (modern production). Hand-rolled teas are typically more expensive because the process is slower and more skilled.
Oxidation is the chemical reaction between the leaf's enzymes and oxygen. It is the single most important process in determining tea type.
White tea: 5-10% oxidation (natural, uncontrolled)
Green tea: 0-5% oxidation (prevented by fixing)
Oolong tea: 15-85% oxidation (carefully controlled and stopped at the desired level)
Black tea: 90-100% oxidation (fully oxidized)
During oxidation, catechins in the leaf convert into theaflavins and thearubigins — compounds that give black tea its dark color, malty flavor, and astringent body. The longer and more complete the oxidation, the darker and bolder the tea.
Drying reduces the leaf's moisture to 2-3%, halting all chemical processes and stabilizing the tea for storage. Methods include oven drying, sun drying (for pu-erh maocha), pan drying, and hot air drying.
This step also develops final flavor notes. Some oolongs undergo additional roasting after drying, which adds toasty, caramel, or charcoal character.
Pu-erh tea adds a seventh step: microbial fermentation. After sun-drying, the leaves are either aged naturally over years (sheng) or pile-fermented in a controlled process over 45-60 days (shou). This is the only tea type where living microorganisms continue to transform the leaf after production.
Understanding how tea is made changes how you taste it. When you drink a green tea and notice its vegetal brightness, you are tasting the effect of fixing. When a black tea has malty depth, that is full oxidation. When an oolong shifts from floral to creamy across multiple steeps, you are experiencing the complexity that partial oxidation creates.
Every cup of tea is the result of decisions made at each processing step — when to pick, how long to wither, when to stop oxidation, how to shape the leaf. The best teas are the ones where every step was handled with skill and intention.
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