In Hindu mythology, Tulsi (“matchless”) is known as Vaishnavi (“belonging to Vishnu”), Vishnu Vallabha (“beloved of Vishnu”), Haripriya (“beloved of Vishnu”), Vishnu Tulsi. The Tulsi with green leaves is
called Shri-Tulsi (“fortunate Tulsi”); also Shri is a synonym for Lakshmi, the principal consort of Vishnu. This variety is also known as Rama-Tulsi (“bright Tulsi”); Rama is also one of the principal avatars of Vishnu. The Tulsi with dark green or purple leaves and purple stem is called Shyama-Tulsi (“dark Tulsi”) or Krishna-Tulsi (“dark Tulsi”); Krishna is also a prominent avatar of Vishnu. This variety is considered esspecially sacred to Krishna, as its purple colour is similar to Krishna’s dark complexion.
One who worships Lord Krsna with Tulasi leaves releases all his ancestors from the realm of birth and death.
Vakti Devi tulsi devi quotes Tulasi
One who remembers the glories of Tulasi or tells others about them will never take birth again.