Holy basil (Ocimum tenuiflorum) belongs to Lamiaceae (the Mint family). It is a subshrub that is native to the Indian subcontinent and widespread as a cultivated plant throughout the Southeast Asian tropics. It is many-branched, 30-60 cm in height with hairy stems. The leaves are green or purple, ovate, up to 5 cm long, with a slightly toothed margin. They are strongly scented and have a decussate phyllotaxy. The purplish flowers bloom in whorls on elongate racemes. The leaves are widely used as a herbal tea, a traditional medicine, or for Thai cuisine.