Indonesia

Why this origin matters

Indonesia is one of the world's five largest coffee producers and, with Vietnam and Brazil, one of the three large sources of robusta. On the USDA's estimates for 2025/26 its harvest was the fourth largest in the world, a little behind Colombia's and a little ahead of Ethiopia's, and about nine bags in ten were robusta. The order among those three is not settled: Ethiopia's crop was the larger the season before, and the same estimates forecast it larger again in 2026/27. Three things make it unlike any other origin. Java is, in the words of a 1922 trade history, the oldest coffee-producing country in which the tree is not native, and the arabica that reached the Americas passed through it. The country changed species almost completely within a few decades of a leaf disease, and the first robusta breeding programme anywhere was set up there as a result. And the arabica of northern Sumatra is processed by a method, wet hulling, that a study for the Food and Agriculture Organization describes as unique to the area.

Where coffee grows

Coffee land has held at about 1.2 million hectares, on the USDA attaché's 2026 report, and Sumatra accounts for about 60 per cent of it. Smallholders, typically farming one to two hectares, hold about 98 per cent of the area. The report describes a small number of large private estates, of roughly 2,000 hectares, in Sulawesi and Sumatra, and a state-owned enterprise that runs a large robusta plantation in East Java. Robusta and arabica grow in different places. The main robusta belt is southern Sumatra, in the provinces of Lampung, South Sumatra and Bengkulu, which the report credits with roughly 80 to 90 per cent of the country's robusta. Arabica is concentrated at the other end of the same island, mainly in Aceh and North Sumatra, with smaller volumes from the highlands of Java, Sulawesi and Papua. Recent new planting has been reported in West Java, Central Java and South Sulawesi.

The attaché's report says a good crop in Indonesia depends on the balance of sunlight and rain after flowering, and that heavy rain and strong wind during flowering and cherry development can cut yields sharply. For altitude CoffeeHQ has two sourced figures, and they are different kinds of statement. A 2025 genetic study of Gayo arabica places the three Gayo districts of Aceh between 900 and 2,000 metres above sea level, which is where the study says the districts lie. The protected geographical indication for Gayo arabica sets a rule that is narrower: coffee carrying the name must be grown and processed on land between 900 and 1,700 metres in those districts. The same report expects arabica to expand only gradually, because labour is short in the high zones that suit it.

Sumatra: two coffees at two ends of one island

Most Indonesian coffee, of both species, comes from Sumatra, and the two are grown at opposite ends of it. The south is robusta country. The USDA's attaché divides its crop into highland areas, which give about 60 per cent, and lowland areas, which give about 40 per cent, harvested at different times. Growers in Lampung commonly buy fertiliser and pesticide on credit from village-level collectors, who are often smallholders themselves, and use family labour for everything except the harvest.

The north is arabica country. A 2025 study of Gayo coffee describes the Gayo Highlands of Aceh as more than 100,000 hectares of coffee across three districts, Aceh Tengah, Bener Meriah and Gayo Lues, with about 78 per cent of the land owned by smallholders and average yields of 700 to 800 kilograms a hectare. Arabica has been grown there since the nineteenth century. Arabica from Aceh and from North Sumatra province leaves through the same port, Medan, under trade names described further down. Sources disagree about when arabica reached the island: Ukers puts its first propagation on the west coast early in the eighteenth century, and the FAO study dates the first planting to the 1780s.

Java and the islands to the east

Java is where coffee started and where the research was done, but it is no longer where most of it grows. Ukers, writing in 1922, recorded coffee in nearly every district of the island, with the bulk of the crop coming from East Java, and more than 400 European-managed estates across the colony in 1915. Today the USDA's attaché mentions Java for a state-run robusta plantation in the east, for arabica in its highlands, for limited new planting in the west and centre, and for the robusta areas of Central Java that lost flowers to rain in 2025. The research institute that descends from the colonial experiment stations is still at Jember, in East Java.

Beyond Java the documents read say little, and this entry says no more than they do. The attaché names Sulawesi and Papua as arabica highlands and Sulawesi as the site of some large private estates. Ukers records coffee on Celebes, Bali, Lombok, the Moluccas and Timor, mostly under local control. Bali is where Indonesia's system of protected names began, described further down. For Flores and the other eastern islands CoffeeHQ has read nothing it can cite.

Species and varieties

Robusta is about nine tenths of the crop on the USDA's estimate for 2025/26, and arabica the remainder; the season-by-season figures are charted above. Liberica is also grown and bred; the national research institute has released a synthetic liberica variety intended for peatland. Robusta yields are low, generally under a tonne of green coffee per hectare, and the attaché reports that few farmers plant improved, higher-yielding seedlings, because many rely on planting material sourced locally and government seedling programmes reach limited areas. The arabica is a mixture. In the Gayo Highlands a 2025 study found cultivation resting largely on three cultivars derived from Catimor, the cross of Caturra with the Timor Hybrid: Gayo I and Gayo II, released by the agriculture ministry, and Gayo III, released in 2020. Around them farmers keep locally named types such as Ateng Super, which the study describes as high-yielding and early but unstable from season to season.

How an arabica colony became a robusta country

For its first two centuries Indonesian coffee was arabica. What ended that was coffee leaf rust, the fungal disease that had destroyed Ceylon's coffee industry after 1869. Ukers wrote in 1922 that the leaf disease had practically driven arabica out of the districts of Java below 3,500 feet, about 1,070 metres, and that it had been succeeded there by hardier kinds.

Liberica was tried first: Ukers reproduces a photograph of the survivors of the first liberica trees brought to Java, in 1876. Robusta followed. It had been found growing wild in the Congo in 1898 and taken up by a Brussels nursery, and Ukers's chronology dates its introduction to Java, from the botanical garden at Brussels, to 1902. A recent review of robusta breeding confirms the Dutch East Indies as the first place to receive robusta from Africa.

The change was fast. By 1919, on the area figures Ukers reports, robusta covered more than three quarters of the coffee land of the colony and arabica about a ninth. A government statement of the same year, which he also quotes, put robusta at 84 per cent. The proportion has hardly moved since: on the USDA's estimates robusta was 89 per cent of the 2025/26 harvest.

The first robusta breeding programme

Having become the first country to depend on robusta, the Dutch East Indies became the first to breed it. A 2025 review written with breeders from the national institute describes three stations that began work on the introduced African material: the Besoeki station at Jember with its field station at Kaliwining, a station in Malang, and the government's experimental farm at Bangelan. Each gave its name to a series of varieties: BP, SA and Bgn. The breeders were after regular bearing, stable yield, larger beans, a better ratio of cherry to green coffee, manageable trees and resistance to disease and pests, and between 1907 and the 1930s they tried in turn mass selection, progeny testing, inbreeding, grafting and cloning.

The review lists what came out. Between 1920 and 1940 the stations released clones including BP 39, BP 42 and SA 34. A hybrid of BP 42 and BP 358 was widely planted in the decades after. Between 1997 and 2005 the national institute released a further set, among them BP 308, which the review singles out as highly resistant to nematodes and suited to dry areas. The releases of 2010 to 2019 are a different kind of variety: selections made by farmers themselves and then officially registered. The newest the review lists, after 2019, are five hybrids bred from earlier releases. The same review says robusta reached Vietnam early in the twentieth century from the Congo, from Indonesia or from both, and that seed from Indonesia went to India and Uganda as well.

Harvest

There is no single Indonesian harvest. The country lies across the equator and its statistical marketing year runs from April to March, but the three producing areas the USDA's attaché describes pick at different times. In the robusta lowlands of southern Sumatra, which give about 40 per cent of that region's crop, the main harvest typically runs from March to May. In the highlands of the same region, which give about 60 per cent, picking in 2026 was expected to start in June or July and run through August. In Aceh the main arabica harvest typically falls in October and November. Farm labour for the harvest in Lampung is shared between farms in rotation to keep costs down. CoffeeHQ gives no timing for Java, Sulawesi, Bali or the eastern islands, because none of the documents read gives one.

How the coffee is processed

Two processes matter, one for each species, and the documents read describe only one of them in detail. Northern Sumatran arabica is wet hulled: the parchment layer is stripped while the coffee is still wet, and the bare bean is dried afterwards. That method is set out step by step below, from a study carried out for the Food and Agriculture Organization. For robusta, which is most of the crop, the USDA's report shows sun-drying but does not describe the process, and CoffeeHQ does not characterise it. Processing in the Gayo Highlands is also more varied than the one method it is known for: a 2023 study collected its samples in the town of Takengon from honey-processed lots, naturals and lots fermented in the cherry, which it calls the wine process.

What wet hulling is, step by step

In the conventional washed process, coffee is dried inside its parchment, the papery husk around the bean, until it reaches about 11 to 14 per cent moisture, and only then hulled. In North Sumatra and Aceh the order is reversed. The method, usually called giling basah, a name the study itself does not use, is described in a study carried out for the Food and Agriculture Organization in the 2004/05 season. The farmer pulps the cherry, ferments and washes it, and sells the result wet: the study gives about 50 per cent moisture when it passes from farmer to trader. The wet parchment may be traded and stored several times before it reaches a huller. It is hulled wet, at 35 to 45 per cent moisture on the study's main description and 40 to 50 per cent in its protocol, and the bare green bean is then dried in the sun.

The machine is an ordinary one, modified. The study describes a screw huller of colonial Dutch design, built in Malang, in which the steel hulling bar is replaced with a rubber strip, the motor uprated from 15 to 25 horsepower and the speed raised from 600 to 750 revolutions a minute. Drying is not always finished in one go. Traders commonly hold the hulled beans, called asalan, at about 17 per cent moisture for up to three weeks before an exporter dries them to 12 per cent.

The study does not say why the method arose, and CoffeeHQ has found no document that does. What it does establish is a risk. Coffee held wet grows mould: in the trial, infection of the parchment rose sharply between the first day and the end of the first week, and the lots were being spread out by day from the eighth day to hold it back. The study reports that lots stored for one or two weeks were generally judged more musty or fruity, though not badly damaged, and that many of them cupped better than expected; in the finished green beans it found no trend in infection by treatment. Mould of the group that includes a strong producer of ochratoxin A, a toxin, was found in five of six lots of parchment held wet for two weeks and in none held for less. The toxin itself was detected in 7 of 42 finished samples, four of them from parchment stored for two weeks, at levels the study calls low and within what might be considered tolerable for green coffee.

Does wet hulling make the taste? One trial tried to find out

Northern Sumatran arabica has a reputation, which the FAO study summarises from the trade's own descriptions as heavy body, low acidity and spicy, earthy or herbal flavours, and which earned it at the time a premium of 40 to 80 per cent over the commodity price. The study set out to test the explanation it thought likely, that the character comes from wet hulling and the long chain of trading and storage that goes with it.

It took fresh wet parchment from six sources in North Sumatra and put each through seven treatments: hulled wet after one day, one week or two weeks of storage, each either dried straight to 12 per cent or held at 17 per cent for three weeks first, and a control dried in its parchment in the conventional way. The 42 samples went blind to four trading companies experienced in Sumatran coffee.

The tasters agreed the character exists: three of the four picked the same sample as the best example, and three of the four rated the conventionally dried sample from the same source the lowest. But the trial could not reproduce the character reliably from any treatment or any source. One taster rated that best sample among the worst, and the tasters said the samples as a whole were cleaner than normal Mandheling. Wet storage for a week or two, the study concluded, appears not to be the primary factor. The treatment that seemed most likely to show the character was the quickest one, hulled after a day and dried at once. A number of the conventionally dried controls were rated cleaner and more acidic, though not by every taster. No statistical analysis was made, because no treatment gave a consistent result. The author's conclusion is that wet hulling appears to be an integral part of the explanation, that its mechanism is unclear, and that variety, growing conditions and farm management were not controlled. It is one trial, of one season, twenty years ago.

How it is graded and sold

Indonesia exports about seven tenths of what it grows, on the attaché's estimate for 2025/26, most of it as green beans and about a ninth as soluble coffee. Shipments to Europe rose 72 per cent in 2025/26, led by Belgium and Germany, which the report attributes to recovered supply, competitive prices and exporters' readiness for the European Union's deforestation regulation. The United States was the third-largest buyer at 797,000 bags; 60 to 80 per cent of what it takes is arabica, most of it shipped through the port of Belawan in North Sumatra. Indonesia also imports coffee, and most of what it imports is soluble; the quantities are charted below. The green beans it buys come mainly from Vietnam, with Brazil second, and a growing share from Papua New Guinea and Timor-Leste. Northern Sumatran arabica is sold under several trade names. The FAO study lists Mandheling, Gayo Mountain and Lintong, which it spells Lintung, among them, sold in numbered grades, and calls Mandheling a generic name for the low-acid, heavy-bodied arabica of North Sumatra and Aceh that is exported through Medan, whichever district it was grown in.

What a protected name protects

Indonesia has had its own register of geographical indications since 2007, and the first name entered in it, in 2008, was a coffee: Kopi Arabika Kintamani Bali. Under the 2016 law a geographical indication is a sign for the area a product comes from, where natural factors, human factors or both give the product its reputation, quality and characteristics. It is applied for by a body representing the producers of the area, or by a provincial or district government, and protection lasts as long as those characteristics do.

The registering directorate counted 182 registered indications of all kinds by 2024. Gayo arabica is one of four it counts as also registered in the European Union. The directorate's own account of enforcement is frank about the limits: it lists Gayo and Toraja as Indonesian coffee names frequently used abroad without authorisation, and gives examples from Japan, the United States and the United Kingdom. A registered name, in other words, records who may use it at home; it does not by itself stop anyone using it elsewhere.

How coffee is drunk in Indonesia

Indonesia drinks nearly two fifths of what it grows. The USDA's attaché estimated consumption at 4.81 million bags in 2025/26, about two thirds of it as roasted and ground coffee and a third as soluble. The report describes two markets side by side: cheap coffee sold by street vendors and mobile hawkers, which it calls popular among workers and low- and middle-income drinkers, and coffee shops in public venues serving a wealthier and younger clientele. It names kopi susu, coffee with milk, as a popular first drink for new coffee drinkers, sold across coffee shops and as a ready-to-drink product. Roasters' margins have been squeezed since 2024 by the price of green coffee, and the attaché reports some demand moving to low and medium grades as spending power softened in 2025/26. Two traditional preparations, kopi tubruk and kopi joss, have their own CoffeeHQ entries, linked below.

Consumption figures are the USDA attaché's estimates in green-bean equivalent. The description of who drinks what is the report's own and is not sourced further there.

Preparation traditions

How coffee is traditionally prepared and served in this country, in CoffeeHQ's international preparation atlas.

• Kopi tubruk
• Kopi joss

History

Arabica seedlings were brought from Malabar in India to Java in 1696, on the account William Ukers gives in his trade history of 1922; they were planted near Batavia and lost to earthquake and flood, and a second lot brought in 1699 became the parent stock of all the arabica of the Dutch East Indies. The first Java coffee was sold at auction in Amsterdam in 1711. Ukers also records a coffee plant grown in Java reaching the Amsterdam botanical garden in 1706, and a 2025 study of Gayo coffee repeats the standard account that the Typica coffees of the Americas descend from a single plant taken from Indonesia to Europe. Coffee spread to Sumatra's west coast in the eighteenth century and, Ukers says, to Celebes, now Sulawesi, about 1750. Through the nineteenth century it was grown under a government monopoly and by compulsion, described below. The state withdrew from coffee in Java in 1905 and in Sumatra in 1908. By then a leaf disease had begun to change what was grown.

Coffee grown under compulsion

For most of the colonial period Javanese coffee was not grown freely. In the eighteenth century, on Ukers's account, the princes of the Preanger highlands paid the Dutch East India Company an annual tribute in coffee. When the Dutch state took over from the Company at the start of the nineteenth century, Marshal Daendels required each family to keep a thousand coffee trees in bearing on village land and to hand over two fifths of the crop, cleaned and sorted, at the government store.

From the early 1830s this became part of what historians call the Cultivation System. An economic study of its legacy describes it as compelling Javanese villagers to produce export crops for the colonial government from the early 1830s to the 1870s. At its peak, the study reports, the system supplied more than a third of the Dutch government's revenue and four per cent of the Netherlands' gross domestic product, and from the 1850s sugar and coffee together accounted for more than 96 per cent of its profits. Under the rules of that period, as Ukers gives them, each family had to raise and tend 650 coffee trees and deliver the crop to the government at a fixed price; the government then sold it at auction in Batavia, Padang, Amsterdam or Rotterdam.

Ukers, a trade writer of 1922, judged the system by its output, noting that forced labour produced about half a pound of coffee per tree against one to two on private estates. The modern study measures something else, the lasting effects on the places subjected to it, and it concentrates on sugar because, as it notes, the surviving coffee records are too coarse for the same analysis. CoffeeHQ has read no study that measures what compulsory coffee growing cost the families who did it.

Pressures on the sector

• Rain at the wrong time. The USDA's attaché attributes the smaller robusta crop it forecasts for 2026/27 to excessive rain in the middle of 2025, which disrupted flowering in the highlands of southern Sumatra and, in Central Java, knocked flowers off the trees and washed pollen away.
• Floods and landslides. In late November 2025 flooding in Aceh and North Sumatra, the two main arabica provinces, damaged plantations, processing facilities, warehouses, roads and bridges. The report cites local government for at least 12,000 hectares of coffee damaged in Aceh, and its contacts for some plantations that may need two to three years to recover. Transport was still impaired in April 2026.
• Drought in an El Niño year. The national weather agency expected the 2026 dry season to be drier and longer than average, and the report notes that El Niño conditions raise the risk of drought severe enough to disrupt flowering.
• Low yields. Robusta gives less than a tonne a hectare, and few farmers have access to improved planting material.
• Mould. Wet hulling means coffee is stored and traded damp, and the one trial read found mould in the parchment rising with each week of wet storage.
• Recovery in the north. Roads, bridges, mills and warehouses in Aceh and North Sumatra were damaged by the floods of November 2025, and transport costs were reported to have doubled.
• Proving where coffee was grown. The European Union's deforestation regulation requires it, and 98 per cent of the area is in holdings of a hectare or two.

All three are one report's account of two seasons. CoffeeHQ has read no long-run climate study for Indonesian coffee and states no trend.

Institutions worth knowing

• Indonesian Coffee and Cocoa Research Institute (ICCRI), Jember, East Java — the national research institute, successor to the colonial-era Besoeki experiment station where the BP series of robusta clones was bred
• Directorate General of Intellectual Property, Ministry of Law — the body that registers geographical indications, including those for named coffees
• Statistics Indonesia (BPS) — publisher of the annual coffee statistics by province, which CoffeeHQ was not able to open and does not quote

Explore Indonesia's coffee from here

A reading order, not a list of everything related: each step picks up something this page raised and takes it further.

1. Step 1Robusta, nine tenths of the cropWhat separates Coffea canephora from arabica in the plant, the field and the cup.
2. Step 2Wet hullingThe process on its own page, set beside the washed and natural methods it differs from.
3. Step 3LibericaThe species Java tried first when rust took its arabica, and still grows and breeds.
4. Step 4CatimorThe rust-resistant group behind the Gayo cultivars that now dominate Aceh's arabica.
5. Step 5TypicaThe arabica line that left Java for Amsterdam in 1706 and went on to the Americas.
6. Step 6VietnamThe larger robusta producer, whose planting material came by way of Java.
7. Step 7Kopi tubrukThe everyday Indonesian cup: ground coffee and boiling water in the glass, unfiltered.
8. Step 8Kopi jossA Yogyakarta street preparation finished with a piece of glowing charcoal.
9. Step 9How coffee was spread by colonial powersThe wider history that Java's forced cultivation belongs to.
10. Step 10Coffee Expert: processingThe lesson that explains what each processing step does before you compare them.
11. Step 11Robusta and conilon cultivarsThe breeding programme begun in the Dutch East Indies, set beside those that followed it.
12. Step 12Tasting LabTaste a wet-hulled coffee beside a washed one and record what you find yourself.