Today Hindu cremations are largely performed in public crematoriums. But still in many parts of the country who have large property perform the cremation in the property especially in Kerala. Growing navadanyam in the cremation spot helps in clearing all kinds of negative energy.
The Navadhanya to be grown are wheat, rice, toor dal, chickpeas, moong beans, white beans, black sesame, Indian black lentil and horse gram.
The Navadhanyams are associated with the Navagrahas or the nine planets. They usher in both positive energy and pluck out the negative energy.
Such practices are now very rarely followed. These things are not superstitions but based on ancient science.