Sprinkling the grave with water and planting vegetation on it

Question:
This questioner says: A woman loves her brother, and Allah the Exalted took him. She sends someone to go to this grave, sprinkle it with water, and place plants on it. What is the ruling and the guidance?

Answer:
This is a bid'ah (religious innovation) and is not permissible. If she wants to benefit her brother in his grave, she should make du'a' (supplication) for him, give charity on his behalf, and perform Hajj or 'Umrah on his behalf. This is what the evidence indicates: that what reaches the dead from the deeds of the living is du'a', charity, Hajj, and 'Umrah. Also, paying off what is owed to him in debts, if he had debts to people and did not leave behind from his estate what would pay them off, then they should pay them off on his behalf. Yes.