The Lajnah ad-Da’imah stated:
Placing a green leaf of a date-palm tree over the two graves hoping that Allah will lighten the punishment of the occupants of these graves is an individual incident confined to the Prophet alone. This was not a regular practice of the Prophet, but was only done twice or thrice according to the number of incidents. The Prophet’s Sahabah [Companions], being the earnest of men to follow the Prophet’s line of conduct and to benefit their fellow Muslims, are not known to have performed this practice. An exception to this is the report narrated from Buraydah Al-Aslamy who asked for two palm leaves to be placed in his grave after his death. No one among the Sahabah is known to have approved of Buraydah’s line of conduct.
May Allah grant us success.
May peace and blessings be upon our Prophet Muhammad, his family, and companions!
[excerpt from alifta.net]
AbdulFattaah bin Uthman