Ocimum tenuiflorum

Lore & Background

Ocimum tenuiflorum is an erect, many-branched subshrub with hairy stems and leaves that are green or purple, simple, petioled, and ovate with a slightly toothed margin. The purplish flowers are arranged in close whorls on elongated racemes. Three main morphotypes are cultivated in India and Nepal: Ram tulsi (broad bright green leaves, slightly sweet), Krishna or Shyama tulsi (purplish green leaves), and the wild vana tulsi. The plant has escaped cultivation and naturalized in many tropical regions of the Americas, where it is considered an agricultural and environmental weed.

Reader's Guide

Ocimum tenuiflorum holds cultural and practical significance across multiple domains. In Hinduism, it is central to Vaishnava worship, with devotees performing rituals involving the plant or its leaves. It is planted in courtyards of Hindu houses or temples to Hanuman, and lamps are lit at its foot during festivals such as Kati Bihu in Assam and Kartik. The Tulasi Vivaha ceremonial festival is performed between Prabodhini Ekadashi and Kartik Purnima. In traditional medicine, it is used in Ayurveda and Siddha practices for its supposed medicinal properties. Culinarily, the leaves are essential in Thai cuisine (as kaphrao) for stir-fries and curries, and in Minangkabau cuisine (as ruku-ruku) for fish gulais. The plant also serves as an insect repellent when dried leaves are mixed with stored grains, and its essential oil has nematicidal properties against several nematode species. The essential oil composition varies among genotypes, with some studies reporting high levels of eugenol or camphor, among other compounds.

Did You Know?

• The plant contains several neolignan compounds, though not a standardized set of ten named 'tulsinol A-J'.
• In Thai cuisine, the leaves are known as kaphrao and used in stir-fries such as phat kaphrao.
• Dried leaves have been mixed with stored grains for centuries to repel insects.
• The essential oil may have nematicidal properties against Tylenchulus semipenetrans, Meloidogyne javanica, Anguina tritici, and Heterodera cajani.