Region · in South Korea
Jeju
Jeju is Korea's volcanic island and its most industrial tea origin. The fields are large, flat, contiguous and machine-picked, at a scale no mainland Korean district approaches, and the biggest of them were cleared out of volcanic scrub within living memory to give a cosmetics and drinks company a reliable supply of green tea. The result is Korean tea made at a scale the peninsula does not attempt, and a good deal of it never reaches a teapot at all.
What grows here
Green tea, in forms the rest of Korea makes little of: powdered tea for cafés and baking, cut and bagged grades, bottled drinks and extract for skincare. The four picking-date grades, ujeon through daejak, are used here too, and there are careful spring lots worth drinking. But the island's centre of gravity is processed volume rather than the loose-leaf spring trade Hadong lives on. The Osulloc gardens and their tea museum are the visible face of it.
The ground
Deep, dark, free-draining volcanic soil on the skirts of Hallasan, heavy rainfall and the mildest winters in Korea. That last point is the real advantage: cold kill, the constraint that keeps tea out of most of the peninsula, is much less of a threat here, and the season opens earlier than anywhere on the mainland. Wind and salt off the sea are the local problem instead, which is why the fields are ringed with tall windbreak hedges.
The bushes
Clonal plantings, chosen for even flushing and machine harvest rather than for character. Uniformity is the point, and it is the reason the fields look the way they do: a block that comes ready all at once can be cut by machine, and a block of individual seedlings cannot. Nothing here was inherited, so nothing here was planted for any reason other than how it would be harvested.
Harvest seasons
The earliest start in Korea, thanks to the mild maritime winter, followed by a long season of repeated machine cuttings. The grade names still apply, so Jeju ujeon and sejak exist and are picked ahead of their mainland equivalents. The later cuttings, which are the larger part of the crop, go to processing rather than to loose leaf.
How it is made here
Pan-firing in the Korean manner at the smaller farms and factory lines at the large ones: steaming, rolling, drying and above all milling, since powdered tea is one of Jeju's principal products. The island also supplies leaf and extract to the food and cosmetics industries, which pulls processing towards consistency and volume rather than towards the character of a particular picking.
What to look for
The Jeju name carries a clean-island premium that gets applied to a great many products, tea included, so it often works as branding rather than as provenance. Powdered green tea sold as matcha is the specific thing to watch: Korean powdered tea is a real product with its own character, but it is not Japanese matcha, and the shading and cultivar selection that define matcha are usually absent. For leaf, ask for the picking grade and the maker, and expect a cleaner, milder cup than the mountain districts give.
How it got here
Tea on Jeju is recent as an industry. The large gardens were reclaimed from volcanic scrub and stone from 1979 onward, by the cosmetics group Amorepacific, on ground long written off as some of the worst farmland on the island: the first work was clearing stones by hand and carting soil in. The gardens expanded through the 1980s and 1990s, and the three estates now run to more than three hundred hectares between them under a single owner, the largest tea holding in the country. That short history is why Jeju has no tradition to appeal to and competes on soil, scale and consistency instead.