Clove

Clove is the dried, unopened flower bud of the evergreen tree Syzygium aromaticum, a member of the Myrtaceae family. The tree grows to 8–12 meters tall and produces clusters of buds that are hand-picked when they turn pink, then sun-dried until they turn dark brown. The spice is native to the five small islands of the Maluku archipelago (formerly the Spice Islands) in Indonesia.¹ Archaeological evidence suggests cloves were traded in the Middle East as early as 1700 BCE. The tree thrives in tropical climates with consistent rainfall and well-drained volcanic soil. Today, Indonesia remains the largest producer, followed by Madagascar, Tanzania, and Sri Lanka.²

Cloves are used whole or ground in cuisines worldwide, particularly in Asian, African, and European spice blends. They are a key ingredient in garam masala, Chinese five-spice powder, and mulled wine. The spice imparts a warm, sweet, and slightly numbing flavor. In traditional medicine, clove oil has been used for centuries as a topical analgesic for toothaches, owing to eugenol's ability to block nerve impulses.³ Modern dentistry has confirmed clove oil's efficacy as a temporary anesthetic and antiseptic for oral infections. Clove extract also exhibits antimicrobial and antioxidant properties in laboratory studies.⁴

Cloves played a pivotal role in the early modern spice trade, sparking brutal colonial competition. The Dutch East India Company (VOC) monopolized clove production by destroying trees on all islands except Ambon, creating one of the first commodity monopolies.⁵ A lesser-known fact: the length of a clove's "head" (the bud) and its "stem" (the calyx) determines its grade; the best cloves are completely intact and sink in water. Clove cigarettes (kretek) originated in Indonesia in the 1880s, when a local mixed clove oil with tobacco to relieve asthma. The resulting kretek industry now consumes about 50% of the world's clove production.⁶ Eugenol is also used in perfumery and as a precursor for synthetic vanillin.

The essential oil of clove buds contains 70–90% eugenol, along with eugenyl acetate, β-caryophyllene, and other minor compounds. Eugenol is responsible for both the characteristic aroma and the pharmacological effects. In vitro studies show clove extracts inhibit the growth of pathogenic bacteria such as Staphylococcus aureus and Escherichia coli.⁴ Clove oil applied topically can reduce pain and inflammation, but ingestion of large amounts may cause liver toxicity or allergic reactions. The U.S. National Institutes of Health classifies clove oil as generally safe when used in small amounts, but warns against internal use of pure eugenol.⁷

Cloves are a major cash crop for smallholder farmers in Indonesia, Madagascar, and Zanzibar (Tanzania). The global market was valued at over $500 million in 2023, with demand driven by both food and kretek cigarette industries. In many cultures, cloves are used in rituals: they are inserted into oranges (pomanders) as a symbol of good luck, and in traditional Chinese medicine they are considered a warming herb for the kidneys. The clove tree also appears as a symbol on the coat of arms of Zanzibar.⁸ Sustainable harvesting practices are increasingly promoted to prevent overexploitation of wild trees.

Eugenol

A phenylpropene compound (C10H12O2) that is the main active constituent of clove oil, responsible for its analgesic, antiseptic, and aromatic properties.

Syzygium aromaticum

The scientific name of the clove tree, a tropical evergreen in the myrtle family, native to the Maluku Islands.

Kretek

A type of Indonesian cigarette that contains a mixture of tobacco, cloves, and other flavorings, known for its distinctive crackling sound.

Pomander

A ball of aromatic spices, often including cloves, carried or worn as a protection against infection in medieval times.