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Ocimum tenuiflorum

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Ocimum tenuiflorum is an aromatic perennial plant. People commonly know it as tulasi, tulsi, or holy basil. It belongs to the Lamiaceae family of plants. This species is native to tropical and subtropical regions. These regions include parts of Asia, Australia, and the western Pacific. Because it grows so well, it has moved to many tropical areas in the Americas. In some locations, it is even considered an agricultural or environmental weed.

Physically, holy basil is an erect, many-branched subshrub. It grows tall and features hairy stems. The leaves are simple and have a shape called an ovate blade. These leaves can be green or purple in color. They have a slightly toothed margin and a strong scent. The leaves grow in a specific pattern called decussate phyllotaxy. The flowers are purplish and grow in close whorls. These flowers are located on elongated stems known as racemes.

There are three main morphotypes cultivated in India and Nepal. The most common type is Ram tulsi. It has broad, bright green leaves with a slightly sweet taste. The second type is Krishna or Shyama tulsi. This variety is less common and has purplish green leaves. The third type is the common wild vana tulsi. This wild version is known as Ocimum gratissimum. Each type offers different characteristics for various uses.

Scientists study the many phytochemicals found in the plant and its oil. Phytochemicals are natural chemical compounds produced by plants. The plant contains tannins, flavonoids, and eugenol. It also contains caryophyllenes, carvacrol, linalool, camphor, and cinnamyl acetate. One study identified a family of ten neolignan compounds called tulsinol A-J. The aroma is very complex due to these substances. Gas chromatography–mass spectrometry analysis found more than 60 different aroma compounds.

Different studies show different amounts of specific aroma compounds. One study reported that the oil contains 32% camphor. It also found 19% eucalyptol and 17% ⍺-bisabolene. This study noted 14% eugenol, 11% germacrene, and 11% β-bisabolene. However, another study gave different proportions for the essential oil. That study stated the oil consists mostly of 70% eugenol. It also found 11% β-elemene, 8% β-caryophyllene, and 2% germacrene. The remaining parts are various trace compounds, mostly terpenes.

Culinary uses for holy basil are very widespread. In Thailand, the leaves are called kaphrao. They are used in stir-fries like phat kaphrao. This dish can include meats, seafood, or rice. Thai cooks use a "red" variant that is more pungent. They also use a "white" version specifically for seafood dishes. In Minangkabau cuisine, the leaves are used in gulai dishes. These dishes often use fish as the primary protein. Examples include gulai ikan mas, which is carp gulai. Other examples include gulai ikan kakap, or red snapper gulai.

Beyond food, the plant has many practical and spiritual roles. For centuries, people mixed dried leaves with stored grains to repel insects. The essential oil may also have nematicidal properties. This means it can act against certain types of worms like Meloidogyne javanica. In Hinduism, tulasi is a sacred plant. Devotees may plant it in courtyards or near temples. During the Kartik festival, people perform worship by lighting lamps. In Assam, people light earthen lamps at the plant during Kati Bihu. It is also used in Ayurvedic and Siddha medicinal practices.

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