Ocimum tenuiflorum, commonly known as holy basil or tulsi, is an aromatic perennial plant in the family Lamiaceae. It is native to the Indian subcontinent and widespread as a cultivated plant throughout the Southeast Asian tropics. Wikipedia
In Indian tradition, the Tulsi (Holy Basil) plant kept at home will prevent evil spirits from entering. It is used in many life and death ceremonies in the Hindi Culture.