Spices · Agriculture · 14 min read

Black Pepper, the King of Spices: Idukki's Black Gold

The spice that brought Romans, Arabs and Europeans to Kerala still climbs the trees of almost every farm in Idukki. The complete story of black pepper: history, cultivation, processing, grading, markets, nutrition, Ayurveda and uses.

By GK Global, Adimali, Munnar · Trails & Tales by GK

Black pepper is the spice that changed the world. Native to the forests of the Western Ghats, it drew Roman ships to Muziris, Arab dhows to the Malabar Coast and, in 1498, Vasco da Gama's fleet to Calicut. It has been called "black gold" and the "King of Spices". Today it is still the most traded spice in the world, and in Kerala, the hills of Idukki are among its greatest strongholds, where pepper vines climb the shade trees of almost every farm.

A spice that made history

Pepper was traded from Kerala to the Mediterranean world at least two thousand years ago. Roman writers complained of the gold that flowed to India to pay for it, and the port of Muziris, near today's Kodungallur, shipped it westwards in great quantities. Arab and Jewish merchants carried it through the Middle Ages, and Venice and Genoa grew rich on its trade. The search for a sea route to the pepper coast drove the Portuguese round Africa to Calicut in 1498, and the Dutch and the English after them. (Read about the merchants of Muziris in the Jews of Kerala.)

Why Idukki?

Pepper is a plant of the humid tropical forest. It needs warmth, heavy, well-distributed rainfall (about 1,500 to 3,000 mm a year), high humidity, a short dry spell before flowering and rich, well-drained soil with plenty of organic matter. It grows from sea level up to about 1,500 m. Idukki's mid and high hills, with their red forest soils and two monsoons, suit it well, and pepper fits perfectly into the district's mixed farms, where it climbs the shade trees of cardamom and coffee plantations and the trees of homestead gardens. Hill pepper from Idukki is valued for its bold berries and pungency.

The plant

Pepper is a woody climber that clings to its support with roots at its nodes. It has three kinds of shoots: main stems that climb, fruiting branches that spread sideways and bear the crop, and runner shoots that creep along the ground and are used to raise new plants. Tiny flowers are borne on hanging spikes, which develop into strings of 50 to 60 round berries, green at first and turning red when ripe.

Many varieties are grown. Traditional cultivars include Karimunda, Kottanadan, Narayakodi and Neelamundi. In 1966, the Pepper Research Station at Panniyur in Kannur released Panniyur-1, the world's first hybrid pepper, and research institutes have since released many more, such as the Panniyur series and IISR Thevam, Sreekara, Subhakara and Girimunda, some suited to the high ranges.

From planting to harvest

• Propagation: cuttings of runner shoots are rooted in a nursery and planted at the start of the southwest monsoon.
• Standards: each vine is planted at the foot of a support, its "standard". In Idukki these are often living trees: Erythrina (murukku), Garuga, Gliricidia, silver oak and the shade trees of cardamom and coffee estates.
• Care: tying the young vines, mulching, manuring, regulating shade and, in the dry months, irrigation where possible. Vines start bearing in about three years and can yield for 20 years or more.
• Pests and diseases: the most feared disease is quick wilt (foot rot), caused by Phytophthora, which can kill vines within days in the monsoon. Slow decline, caused by nematodes and fungi, and the pollu beetle, which hollows the berries, also cause heavy losses.
• Harvest: spikes are picked by hand when one or two berries on the spike turn red or yellow, often from bamboo ladders. In Idukki most harvesting falls between December and March.

Processing: black, white and green pepper

• Threshing: berries are separated from the spikes by trampling or with threshing machines.
• Blanching: dipping the berries in boiling water for about a minute, now widely recommended, cleans them, speeds drying and gives a uniform black colour.
• Drying: the berries are sun-dried on clean mats or concrete yards for about 7 to 10 days, or in driers, until the moisture falls to about 10 to 11 percent. As they dry, the skin wrinkles and turns black. Roughly a third of the fresh weight remains as dry pepper.
• White pepper: fully ripe berries are soaked in water for a week or more (retting), and the outer skin is rubbed off, leaving the white seed.
• Green pepper: immature berries are preserved in brine, freeze-dried or dehydrated to keep their colour and fresh flavour.

Sorting and grading

Dry pepper is cleaned and sorted to remove stalks, dust, stones and light, hollow berries (which float on water). It is then graded by berry size, density, moisture and the proportion of light berries. The best-known Indian export grades are:

Moisture should not exceed about 11 percent. "Garbled" means cleaned of stalks and extraneous matter. Pepper with a high bulk density (grams per litre) is preferred, since it indicates well-filled berries.

Markets and trade

Farmers sell their pepper to local dealers in market towns such as Kattappana, Nedumkandam, Adimali and Thodupuzha, and through cooperatives. The main terminal market and the price-setting centre for Indian pepper is Kochi, where the spot market of the trade has operated for generations. Prices follow world supplies, especially the harvest in Vietnam, and the domestic crop. In 2025, domestic prices were around ₹690 to 715 a kilo.

India is now both an exporter and an importer of pepper. Indian exporters ship premium grades, ground pepper, pepper oil and oleoresin to the United States, Europe, the Middle East and elsewhere, while cheaper pepper is imported from Sri Lanka and Vietnam, much of it for processing and re-export. A minimum import price is set to protect Indian growers.

Nutrition

Approximate values; source: USDA FoodData Central. Spices are eaten in small amounts, so a typical serving supplies only a small share of these nutrients.

Pepper's heat comes from the alkaloid piperine, usually 3 to 9 percent of the dry berry, and its aroma from an essential oil rich in compounds such as pinene, limonene and caryophyllene. Piperine is known to increase the absorption of some other substances, such as curcumin from turmeric, which is why pepper and turmeric are traditionally used together.

Pepper in Ayurveda

In Ayurveda, black pepper is Maricha. It is described as pungent and hot, and is traditionally used to kindle digestion, clear phlegm from the chest and throat, and relieve cold and cough. It is one of the three ingredients of Trikatu, "the three pungents", with dry ginger (shunthi) and long pepper (pippali), one of the most widely used formulations in Ayurveda. Pepper is also used in Siddha and Unani medicine.

These are traditional uses. Spices are safe in normal food amounts; anyone thinking of using them as medicine, especially in pregnancy, while taking other medicines or for a child, should ask a qualified doctor.

Uses

• Kitchen: the most widely used spice in the world, in almost every cuisine: Kerala's pepper chicken and rasam, sauces, soups, marinades and spice mixes. Whole pepper keeps its aroma for years; grind it fresh.
• Food industry: ground pepper, cracked pepper, green pepper products, pepper oil and oleoresin for processed foods, meats and snacks.
• Health products: piperine extracts in nutraceuticals and supplements.
• Perfumery: black pepper essential oil in perfumes and aromatherapy.
• Other uses: traditional insect repellents and preservatives.

Challenges

• Disease: quick wilt and slow decline have killed vast numbers of vines.
• Climate: erratic rain and long droughts reduce flowering and berry set.
• Prices: competition from cheaper Vietnamese and Sri Lankan pepper keeps prices volatile.
• Labour: harvesting from tall standards is hard, skilled work, and labour is scarce and costly.