Tulsi – that can be used in the service of Radha and Krishna (like deity worship) is commonly found in two varieties – the green coloured Lakshmi Tulsi (or Radha Tulsi) and the purple hued Krishna Tulsi (also Shyam Tulsi, Vishnu Tulsi or Vishnu Priya Tulsi). Ayurveda also uses names like White Tulsi (Shweta Tulsi) and Black Tulsi (Krushna Tulsi) respectively.