Region · in India
Assam
Assam is the largest tea-growing region in the world by output: one river valley in India's northeast that makes around half of the country's crop and supplies a large share of everything that ends up in a teabag. It is also the only place the British planted from a tea plant they found growing there rather than from imported Chinese seed, which is why it is planted almost entirely with the local broad-leaf assamica. Botanically original and industrially enormous is an unusual combination, and it explains most of what the place is.
What grows here
Black tea, and effectively nothing else. Most of it is CTC, sold by the kilo for the domestic market, for chai and for the teabag trade. The minority orthodox stream is what a specialty buyer comes here for: whole and broken leaf from named estates, at its best in the tippy second flush lots. Small quantities of green and white tea are made from the same bushes, as an experiment rather than a tradition.
The ground
The Brahmaputra valley is a flood plain barely above sea level, with the Himalayas to the north and the Naga and Patkai hills to the south. It takes several thousand millimetres of rain a year, most of it in the monsoon, and summer temperatures push into the mid thirties Celsius, so the valley behaves like a glasshouse through the growing season. The silt the floods leave behind is what makes the soil, and drainage is the central agronomic problem of every garden on it. Assam has a second, smaller growing zone as well, the Barak valley in the south of the state, which older tea literature calls Cachar.
The bushes
Assamica, the broad-leaf variety found growing here, is what nearly every bush in the valley descends from. Growers still talk in jats, the old seed lineages (Assam, Manipuri, Cambod, China), because the ancestry shows up in leaf size and in the cup, and because the Tea Board's list of approved planting material still tags every clone by it. Modern planting is clonal, from the TV series bred at Tocklai in Jorhat, which supplies Darjeeling and the Nilgiris as well. That shift carries a cost the old seed gardens did not have: a bush struck from a cutting roots shallower and lives far shorter than a seed-grown one, so replanting is a permanent budget line.
Harvest seasons
The season runs from roughly March to November, far longer than Darjeeling's, and the second flush in May and June is the one to chase: that is the malty, tippy Assam the region's reputation rests on. First flush leaf here is lighter and greener and rarely sold on its own abroad. The rest of the year is volume, picked through the monsoon in conditions that are genuinely hard on the people doing the picking. Most of the crop is never described by flush at all, because CTC is bought on grade and briskness rather than on when it was cut.
How it is made here
Assam oxidises long and fully. Where a Darjeeling first flush is deliberately stopped early to keep it green-edged, an Assam is left to run out, and that is where the malt, the dark liquor and the thickness come from. CTC was worked out on these estates in the 1930s and remains the local default, but the orthodox lots run the same full oxidation, which is why an orthodox Assam still tastes recognisably like Assam rather than like a hill tea. The variable that separates a good orthodox lot from a dull one here is tip content, not oxidation level.
What to look for
Ask for the estate and the district. Upper Assam, the eastern end of the valley around Dibrugarh, Tinsukia and Jorhat, is where most of the benchmark orthodox lots come from, while 'Assam' unqualified is a blend and usually CTC. Barak valley tea from the south of the state is Assam by geography and rarely by reputation. The other thing to know is that Assam is the tea most often hidden inside something else: it is the productive region next door to Darjeeling and it is what cheap Darjeeling is padded with, so a suspiciously affordable Darjeeling is frequently Assam in a better-known jacket.
How it got here
The Singpho and other communities in the east were using the local leaf long before any of this, so Robert Bruce's 1823 report was a European noticing an existing practice rather than a discovery. What followed was industrial and brutal: jungle cleared along the Brahmaputra at scale, and labour recruited from central India under indenture. That is why Assam has a large Adivasi population today, the tea tribes, descended from those workers and still tied to the gardens. The Plantations Labour Act of 1951 set the terms estates are still judged against, and garden housing, schooling and wages remain the live argument about the region.
Places in Assam
Named places inside Assam. The ones with a page of their own are links.