This office keeps the record of how Assam became tea. The short version: a large-leaf tea plant, Camellia sinensis var. assamica, was growing wild in the Brahmaputra valley and used by local people long before the trade noticed it. The British noticed it in 1823, took the valley by treaty in 1826, raised the first commercial crop in the 1830s, and sold the first chests in London in 1839. The Assam Company was formed that same year. A century later a machine called CTC turned Assam into the strength inside the world's tea bags. Assam is the largest tea-growing region on earth by volume. The sections below document each part of that arc in order. The dates and figures are sourced and durable; the deeper stories are routed to the linked articles.

The plant: assamica, growing wild

For most of the history of the tea trade, tea meant China and the plant meant the small-leaf China variety, Camellia sinensis var. sinensis. Assam grew a different plant: Camellia sinensis var. assamica, large-leaved, suited to a hot, wet, low valley rather than a cool Chinese hillside. It was not introduced. It was already there, growing wild in the forests of upper Assam, and the Singpho and Khamti people of the region were already using its leaves for a drink and for food.

That is the single fact that changed the map of tea. It meant the crop could be grown outside China, at scale, on land an empire controlled. Everything that follows is the working out of that fact.

1823: the plant is noted

In 1823 a Scottish trader, Robert Bruce, was travelling in upper Assam when he was introduced to the plant the Singpho used. The introduction was made through Maniram Dewan, a young Assamese official, who directed Bruce to the local Singpho chief, recorded as Bessa Gam (also written Bisa Gaum), who showed him the tea shrubs. Bruce arranged to be given leaves and seeds for examination and died soon after, in 1824, without seeing the plant classified.

The work was carried on by his brother, Charles Alexander Bruce. In the early 1830s Charles had samples sent to the botanical gardens in Calcutta, where the plant was confirmed as a true tea, distinct from the China variety. That confirmation is what turned a curiosity into a project. The deeper account of Maniram Dewan, who planted the first Indian-owned tea garden and was later hanged by the British, is in the linked article.

1826: the valley changes hands

The hunt for a tea worth growing could only happen on ground the British held, and they came to hold Assam just before the tea did. The Ahom kingdom that had ruled the valley was collapsing, and a Burmese occupation that began in 1821 brought it into conflict with British India. The First Anglo-Burmese War (1824 to 1826) ended in a decisive British victory and the Treaty of Yandabo, signed on 24 February 1826, by which Burma ceded Assam, Manipur, Arakan, and Tenasserim to the East India Company.

The politics of the annexation are not this office's brief. The date is, because it set the precondition: only on Company-held ground could the search for a commercial tea begin at all.

The 1830s: from wild plant to first crop

With the plant confirmed and the land held, the Company moved to test whether it could be grown and made. A government tea garden was established in 1833. Charles Bruce was appointed superintendent of the Assam tea plantations and, in 1836, sent a sample of manufactured tea to the Tea Committee in Calcutta. By 1837 he had a full consignment ready: the records give 46 chests of tea made from the indigenous Assam plant.

This is the stretch where Assam tea stopped being a botanical question and became an industry decision. The fuller story of how the East India Company commissioned that experiment, between the loss of its China monopoly and the first sale, is documented in the linked article.

1839: the first chests, and the Assam Company

The Tea Committee forwarded eight of Bruce's chests, weighing 350 pounds, to London. They were put up for auction in Mincing Lane on 10 January 1839, the first Indian tea ever sold at auction. The lot sold well, though buyers found it less fragrant than the Chinese tea they knew.

That same year the trade organised itself. Two bodies were incorporated, the Assam Tea Association in London and the Bengal Tea Association in Calcutta, and they quickly merged into the Assam Company, the first commercial tea company in India. This office dates its own charter to 1839, on the reasoning that a tea worth selling is a tea worth measuring. The full account of that first sale and the auction system it founded is in the linked article.

The plantation valley

The decades after 1839 turned the Brahmaputra valley into a vast tea estate, organised around gardens, processing factories, and the river that carried the crop out. Labour for the gardens was brought in on a large scale from outside Assam, from central and eastern India, under an indenture system. The descendants of those workers are the tea-tribe or Adivasi communities, and they remain central to how Assam tea is grown and picked. That history, and the people who carry it, are documented in the linked article on the garden workforce.

Research followed the gardens. The Tocklai research station was established in 1911 to study Assam's tea scientifically, one of the oldest tea research institutions in the world.

CTC: how Assam reached the world's cups

Assam's natural strength, the malty briskness of the assamica plant, made it the base of the everyday cup, but one twentieth-century invention sealed that role. CTC, for crush, tear, curl, is a processing method in which withered leaf is passed through toothed rollers that crush, tear, and curl it into small hard pellets. The first CTC machine was put into service in 1930 at the Amgoorie estate in Assam, developed under the planter Sir William McKercher.

CTC made a strong, fast-brewing, broken tea ideally suited to the tea bag, which spread through the twentieth century. The breakfast blends that took over British and Irish tables were built on Assam's strength, and brisk CTC Assam became the character inside the bag. Without often being named, Assam became the most-drunk tea character in the world, the one most people mean by a strong cup of tea. How CTC differs from the older orthodox method, and what each does to the cup, is documented in the linked article.

Assam as a tea producer

Assam is the largest tea-growing region on earth by volume, and produces more than half of all the tea India makes. The Government of Assam states the region's estimated annual average production as 630 to 700 million kilograms. It is a working landscape of large estates and tens of thousands of smallholders, organised around the flush, the grade, and the auction. The Guwahati Tea Auction Centre, opened in 1970, handles the largest volume of CTC tea of any auction in the world.

The tea has not changed its nature. It is still hot-valley tea, still malty, still brisk, still built for the morning. The Authority's charter, copper and bolted down, still reads as it did in 1839: strength is a public good, and no morning should face the day without it.

Timeline

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