Turmeric
A flowering plant used as spice, dye, and in traditional medicine.
Turmeric (Curcuma longa) is a perennial, rhizomatous, herbaceous flowering plant in the ginger family Zingiberaceae, native to the Indian subcontinent and Southeast Asia. It requires warm temperatures and high annual rainfall to thrive. The plant grows up to one meter tall, with highly branched, cylindrical, aromatic rhizomes that are yellow to orange inside. Its leaves are arranged in two rows, forming a false stem from their sheaths, and the leaf blades are oblong to elliptical. The inflorescence features white to green stem bracts, sometimes tinged reddish-purple, and the hermaphrodite flowers are zygomorphic with three bright-yellow petals fused into a corolla tube. Only the median stamen of the inner circle is fertile; the others are converted into staminodes, with a yellowish labellum marked by a central yellow ribbon.
The rhizomes are gathered annually; some are reserved for propagation, while others are consumed fresh or processed. Typically, they are boiled in water, dried, and ground into a deep orange-yellow shelf-stable powder. This spice has a warm, bitter, black pepper-like flavor and an earthy, mustard-like aroma, commonly used as a coloring and flavoring agent in Asian cuisines, particularly in curries. Curcumin, the bright yellow chemical responsible for turmeric’s color, is approved as a food additive by the World Health Organization, European Union, and United States Food and Drug Administration. Although turmeric has long been used in Ayurvedic medicine, no high-quality clinical evidence supports its effectiveness in treating any disease. Turmeric and curcumin are generally safe, but high-bioavailability forms have been linked to rare cases of immune-mediated acute liver injury, which typically resolves upon stopping use, though severe outcomes can occur if use continues.
- Scientific name
- Curcuma longa
- Family
- Zingiberaceae
- Native region
- Indian subcontinent and Southeast Asia
- Height
- Up to 1 m (3 ft 3 in)
- Key compound
- Curcumin
- Culinary use
- Spice and coloring agent
- Historical use
- Dye, folk medicine, and ritual
Lore & Background
Turmeric has been used in Asia for centuries, first as a dye and later for its supposed properties in folk medicine. It is a major part of Ayurveda, Siddha medicine, traditional Chinese medicine, Unani, and animistic rituals of Austronesian peoples. In India, it spread with Hinduism and Buddhism, where the yellow dye colors the robes of monks and priests. Linguistic evidence suggests ancient use among Austronesian peoples soon after their dispersal from Taiwan, before contact with India. In Maritime Southeast Asia, turmeric was used for food, dyeing textiles, medicine, and body painting, and was an important ingredient in animistic rituals. It was also spread with the Lapita people into Oceania, reaching as far as Hawaii and Easter Island before European contact.
Reader's Guide
Turmeric's significance lies in its dual role as a culinary staple and a historically important dye and ritual substance across Asia and Oceania. Its rhizomes, processed into a shelf-stable powder, impart a warm, bitter, black pepper-like flavor and earthy, mustard-like aroma to dishes, and are a key ingredient in curry powders. Despite long use in Ayurvedic medicine, there is no high-quality clinical evidence that consuming turmeric or its principal constituent curcumin is effective for treating any disease. Curcumin is approved as a food additive by major global health organizations. Turmeric and curcumin are generally safe, though high-bioavailability forms have been linked to rare cases of immune-mediated acute liver injury that typically resolve after stopping use. The taxonomy of Curcuma longa is problematic, with only specimens from South India being identifiable as the species, while other taxa are sold as turmeric in other parts of Asia.
Did You Know?
- Turmeric requires temperatures between 20 and 30 °C and high annual rainfall to thrive.
- The greatest diversity of Curcuma species is in India, with around 40 to 45 species.
- Turmeric was found in a merchant's tomb in Megiddo, Israel, dating from the second millennium BCE.
- In Medieval Europe, turmeric was called 'Indian saffron.'
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