Zanzibar's Spice History: How Cloves Made the Island Rich

Walk into Darajani Bazaar in Stone Town and within two minutes you are surrounded by cloves, cinnamon sticks, vanilla pods, nutmeg, and cardamom. The smells hit before you see the stalls. What you are standing inside is the living end of a two-hundred-year economic story — one that moved the capital of an empire, fuelled the East African slave trade, and connected a small island in the Indian Ocean to spice markets in London, Hamburg, and Bombay.

This is the deeper story behind the spice. The Zanzibar spice tour guide covers what it is like to walk a working farm. This guide covers where those spices came from, what they meant, and why Zanzibar has the title it does.

Why the title “Spice Island” is really about cloves

“Spice Island” is not a general compliment. It is a specific economic fact, and the specific spice is cloves (Syzygium aromaticum — the dried flower bud of a tropical tree in the myrtle family).

By 1834, Zanzibar and the neighbouring island of Pemba together produced approximately 90% of the world’s clove supply. Nothing in the history of the modern spice trade comes close to that level of concentration. The islands did not merely produce a lot of cloves — they controlled the world’s clove market for the better part of sixty years.

The consequences reached everywhere the clove trade reached: European spice markets, Indian credit houses, Omani trading networks, and the plantation economy of the East African coast. The economic and cultural transformations that came from clove cultivation shaped the entire Swahili coast from Mombasa to Mozambique. Stone Town’s carved-door palaces, the Anglican Cathedral built on the site of the slave market, the Indian merchant families who financed the plantations — all of it connects back to the clove.

Other spices grow in Zanzibar — cinnamon, nutmeg, vanilla, pepper, cardamom — and they matter. But the Spice Island title was earned by one crop, on one set of islands, in one sustained period of market dominance.

Where cloves came from: the Maluku Islands to Zanzibar route

Cloves are not native to East Africa. They originated in the Maluku Islands in what is now Indonesia — specifically the northern Maluku Islands of Ternate, Tidore, Bacan, and Halmahera. These are the original “Spice Islands,” the ones that sent European powers to sea in the 15th and 16th centuries looking for a direct route around the Portuguese and Arab middlemen.

The Portuguese established control over the Maluku clove trade from the early 16th century, using their naval presence to extract what had previously been handled through Arab and Indian Ocean trading networks. The Dutch VOC (Vereenigde Oost-Indische Compagnie) took over in the early 17th century and enforced a monopoly that was brutal even by the standards of colonial extraction: VOC forces burned clove trees on islands they didn’t directly control, destroying entire village economies to prevent anyone growing cloves outside their permitted territories.

The plant escaped Dutch control through a French operation. In the 18th century, Pierre Poivre — a French colonial officer — arranged for clove seedlings to be smuggled from the Maluku Islands to French colonies in the Indian Ocean: first to Île de France (Mauritius) and then to Bourbon (Réunion). The Dutch monopoly was broken.

From Réunion, clove seedlings reached Zanzibar in the early 19th century. Sources cite either 1812 or 1818 — the date is contested in the historical record, with different accounts giving different years. The most commonly cited story credits a Zanzibari merchant, Saleh bin Haramil al-Abray, as the man who brought the seedlings across. The introduction was supported by Sultan Said bin Sultan (Seyyid Said) of Oman, who recognised what the plant could produce in Zanzibar’s climate.

The geographical journey the clove made before it reached Zanzibar is extraordinary: native to the northern Maluku Islands, controlled by Portugal, taken by the Dutch, smuggled by the French to Réunion, and then carried to Zanzibar — where it found a climate, a trading infrastructure, and a ruler willing to build an economy around it.

Sultan Seyyid Said and the clove transformation

Sultan Said bin Sultan — usually called Seyyid Said in the historical record — was the ruler of the Omani Sultanate, an empire centred on Muscat that controlled significant territory around the Indian Ocean, including a long-standing presence on the East African coast. What he did with cloves was remarkable: he turned a garden plant introduction into the basis of an economic transformation, and then moved his entire court to be closer to it.

In 1840, Seyyid Said moved the Omani Sultanate capital from Muscat to Stone Town, Zanzibar. Some sources date his effective move to Zanzibar as early as 1832; what is clear is that by 1840 Zanzibar was his primary residence and the centre of his political and commercial attention. Moving the capital of an empire from the Arabian Peninsula to an East African island — 5 hours and 15 minutes by air today — was an extraordinary act. His reasons were partly strategic and partly economic: Zanzibar sat at the pivot point of the Indian Ocean monsoon system, its clove economy was already producing returns, and the island was already a major trading hub for ivory, enslaved people, and coastal goods.

Seyyid Said is associated in most historical accounts with a decree requiring landowners to plant clove trees alongside their coconut palms — the commonly cited version specifies three clove trees for every coconut palm. Whether this specific ratio was a formal decree or a looser directive is historically contested. What is not contested is the result: clove cultivation expanded dramatically during his reign, and by 1834 the archipelago produced approximately 90% of the world’s clove supply. When Said died in 1856, Zanzibar had the largest clove plantation system in the world.

Said also built substantial infrastructure in Stone Town during this period. Mtoni Palace was completed in 1828; the Kidichi Persian Baths were built in 1850 for his Persian wife. These structures, still partially standing, are products of the clove economy’s first decades of wealth.

Cloves, the slave trade, and abolition

The clove economy and the East African slave trade were structurally inseparable. Understanding one requires understanding the other.

Cloves must be harvested as tight, unopened flower buds. Once the buds begin to open, the quality drops sharply and the commercial value falls. This means that clove harvesting is intensely time-limited: when the harvest moment comes, large numbers of people must pick fast. The work cannot be effectively mechanised — even today, commercial clove harvesting remains highly manual. On the expanding plantations of 19th-century Zanzibar and Pemba, that labour demand was met by enslaved people.

Zanzibar was already the main slave-trading port of East Africa before the clove boom. An estimated 40,000 to 50,000 enslaved people per year passed through the island at the peak of the trade, with an estimated 600,000 people sold at Stone Town’s slave market between 1830 and 1873 alone. The clove expansion did not create the slave trade — but it accelerated it, turning what had been a transit trade into a local labour system anchored to the clove harvest.

Indian merchants — particularly the Banyani trading community — financed much of the plantation development on credit. By the 1870s, Indian credit was central to the entire Zanzibar economy: clove planters borrowed against future harvests, and the credit chains ran from Stone Town through Indian merchant houses to trading networks across the Indian Ocean.

British pressure to end the slave trade had been building for decades, with the Moresby Treaty (1822) and Hamerton Treaty (1845) placing successive restrictions on Zanzibar’s slave exports. In June 1873, Sultan Barghash bin Said — Seyyid Said’s son — signed a treaty formally prohibiting the seaborne slave trade. The slave market in Stone Town was closed the same year, and the Anglican Cathedral now stands on the site where the whipping post stood.

The 1873 treaty ended the export trade but not slavery itself within Zanzibar. Enslaved people continued to work the clove plantations under their existing arrangements. Full emancipation was formally declared in 1897, under the British protectorate. The transition from enslaved labour to paid tenant farming reshaped how the plantations operated, though the underlying land ownership — concentrated among the Arab planter class — remained largely unchanged for decades.

The other spices: nutmeg, cinnamon, vanilla, pepper, cardamom

Once the clove economy established a functioning agricultural and trading infrastructure on Zanzibar, other spices arrived — mostly from the same Indian Ocean trade routes that had brought the clove seedlings.

Nutmeg (Myristica fragrans) came from the Banda Islands, another part of the Maluku archipelago — also historically under Dutch monopoly, also escaped in the 18th century via French colonial acquisition. The nutmeg tree produces one of the most surprising products in the spice world: what looks like a single fruit contains three separate commercial products. The outer green flesh is sometimes made into local juice or jam. Inside that is the mace — a bright scarlet, lace-like aril. Inside the mace is the hard brown shell, and inside that shell is the nutmeg seed itself. Mace and nutmeg are sold as two distinct spices, but they come from the same fruit.

Cinnamon (Cinnamomum zeylanicum — Ceylon cinnamon) comes originally from Sri Lanka. The cinnamon in Zanzibar is true Ceylon cinnamon, which is genuinely different from the cassia (Cinnamomum cassia) sold in most supermarkets under the “cinnamon” label. Cassia comes from China and Vietnam and contains approximately 1% coumarin — a compound that in large doses is a liver toxin. True Ceylon cinnamon contains approximately 0.004% coumarin, roughly 250 times less. The flavour difference is also real: Ceylon cinnamon is lighter, sweeter, and more complex than the blunt intensity of cassia. Zanzibar’s cinnamon belongs to the Sri Lankan tradition, the original that colonial traders were trying to replicate when they settled for cassia.

Vanilla (Vanilla planifolia) is a climbing orchid native to Mexico. Outside its native habitat, it requires hand pollination — the Melipona bee that pollinates it naturally in Mexico does not exist in Zanzibar. Every vanilla pod on the island is the result of someone’s early-morning hand-pollination work, because each flower opens for a single morning and must be pollinated in those hours. The pod then takes nine months to mature. The labour cost is embedded in every bean, which is why real vanilla is expensive everywhere it is grown outside Mexico.

Black pepper (Piper nigrum) is native to Kerala in South India and grows well on Zanzibar and Pemba. It was part of the ancient Indian Ocean trade long before the clove economy arrived.

Cardamom (Elettaria cardamomum) is native to South India and thrives in Zanzibar’s humid climate. The green pods contain seeds used whole or ground in Swahili pilau, chai, and desserts.

The clove economy today

Indonesia now dominates global clove production — the country that was once the source of the clove has also become the world’s largest producer and consumer. Zanzibar’s market share is a fraction of what it was in the 1830s and 1840s.

Zanzibar and Pemba still produce cloves, and the quality remains high. Pemba in particular still has significant clove tree density — more clove trees per square kilometre than almost anywhere else in the world. The production structure has shifted from the large Arab-owned plantations of the 19th century to family smallholdings, with the Zanzibar State Trading Corporation (ZSTC) historically controlling clove exports. Private export has expanded in recent decades.

The farms at Kizimbani — approximately 20 to 30 minutes from Stone Town — represent the living agricultural side of this history, now oriented largely toward tourism. The demonstration plots are not the largest commercial farms, but they are where the plant can be seen and understood. Standing in front of a clove tree and smelling a fresh bud is a different experience from smelling a jar of dried cloves in a kitchen drawer.

For the full practical guide to visiting — timings, prices, what to taste, and how to pick a good operator — see the Zanzibar spice tour guide.

What I found in the Kizimbani nutmeg tree

The thing that stayed with me from the spice farms was a nutmeg tree. The guide pulled one of the ripening fruits open and went through it layer by layer. The outer green flesh — he said locals make it into juice. Then the mace came off, bright red and intricate, wrapped around a dark brown shell. He cracked the shell open. Inside was the nutmeg seed itself, pale and dense.

Three distinct commercial products from one fruit, on a tree that came from the Banda Islands in Indonesia — the same archipelago that sent the clove seedlings on their long route through Portuguese and Dutch control, French smuggling, Réunion, and finally across the Indian Ocean to Zanzibar. The same Indian Ocean trade routes that brought the clove story also brought the nutmeg story. The whole spice world in one fruit, on one farm, thirty minutes from Stone Town.

That is what “Spice Island” actually means. Not a general description of a pleasant tropical place that smells nice. A specific history of economic ambition, trade route control, enforced labour, and the extraordinary coincidence of a small island in the Indian Ocean being exactly the right place, at exactly the right moment, for a plant from Indonesia to become the basis of an empire.

Where to go next

• Zanzibar spice tour guide — practical guide: what you taste, prices, timings, and how to pick a good farm
• Zanzibar history guide — the full arc of Swahili coast history: Omani Sultanate, slave trade abolition, the 1964 revolution, and Freddie Mercury’s birthplace
• Stone Town practical guide — how to navigate the UNESCO alleys, the slave market site, and the carved-door architecture that the clove economy built
• Zanzibar food guide — the pilau, the coconut rice, and the Swahili cuisine that grew directly from the spice economy