From garden to packing

Assam sits on the floodplains of the Brahmaputra, a low-altitude valley with deep alluvial soil, high humidity and heavy monsoon rainfall. That combination is what gives Assam tea its weight in the cup: a brisk, malty, full-bodied liquor that few other origins can reproduce.

Bushes are planted in shaded rows and maintained on a plucking table so that new shoots emerge at a uniform height. Pruning cycles, drainage, shade management and soil nutrition are all planned around the flush calendar — first flush from March, the prized second flush from late May, rains flush through the monsoon, and autumnal flush before the season closes.

Only the top two leaves and the unopened bud are taken. This is the youngest, most tender part of the shoot and carries the highest concentration of the compounds that later produce briskness, colour and aroma.

Fine plucking standards are the single largest determinant of final grade. Coarse leaf carries stalk and mature foliage that dulls the liquor and reduces the proportion of clean, well-made grades after sorting.

Green leaf is weighed, kept loose and ventilated, and moved to the factory within hours of plucking. Compacted or delayed leaf begins to heat and ferment unevenly in transit, which cannot be corrected later.

On arrival the consignment is inspected for leaf standard, moisture and foreign matter before it enters the withering trough.

Leaf is spread in long troughs and ambient or slightly warmed air is drawn through the bed for 10 to 16 hours. Physical withering removes roughly a third of the moisture so the leaf becomes pliable; chemical withering develops the precursors of aroma.

Withering percentage is chosen for the intended output — a harder wither for Orthodox rolling, a softer wither for CTC.

CTC (Crush, Tear, Curl) passes the withered leaf through counter-rotating toothed rollers that cut and curl it into dense granules. The result brews rapidly with strong colour and body, which is why CTC dominates tea bags, blends and everyday retail packs.

Orthodox rolling instead twists the leaf gently under pressure, keeping it whole or in large pieces. It is slower and yields less, but preserves tips and volatile aromatics, producing a lighter, more fragrant and layered liquor for specialty and premium loose-leaf markets.

Green tea takes a third route: the leaf is steamed or pan-fired immediately after withering to deactivate the enzymes, so oxidation never begins and the leaf stays green and vegetal.

Rolled leaf rests in a temperature- and humidity-controlled room where enzymatic oxidation turns it from green to copper. Timing is measured in minutes for CTC and considerably longer for Orthodox; the taster's judgement of colour and smell decides when to stop.

Drying fixes that point in time. Hot air at controlled temperature brings moisture down to roughly 2–3%, arresting oxidation and making the tea stable for storage and shipping.

Dried tea is passed over vibrating mesh sorters and fibre extractors, separating it into grades by particle size, shape and cleanliness — whole leaf, brokens, fannings and dust.

Each grade is then tasted and lotted. Grading is a description of leaf make and appearance, not a quality score: a well-made dust grade can outperform a poorly made leaf grade in the cup.

Approved lots are weighed into food-grade lined paper sacks, jute bags or customised packaging, sealed, batch-coded and documented.

Consignments leave Guwahati for domestic buyers and export markets with batch reference, grade, invoice and specification records attached.