New moon in Shravan month — called Hariyali (green) Amavasya, auspicious for planting trees and worshipping nature.

Hariyali Amavasya is the new moon of Shravan, celebrated across North India as the green new moon — the point at which the monsoon has fully taken hold and the land has turned green after the heat of summer. It is above all a day of tree planting: families plant saplings of peepal, banyan, neem, mango and tulsi, and the act is treated as a religious offering rather than a civic gesture. In Mathura and Vrindavan the day draws large crowds for the swing festival at the Krishna temples, where the deity is placed on a decorated jhula. Alongside the celebration, the usual Amavasya observances hold: a pre-dawn bath, tarpan to the ancestors, and charity of food and grain.

No formal fast is required. Those performing tarpan traditionally fast until the ancestral rites and charity are complete, then take one satvik meal.