The Ekadasi that occurs during the Krishna paksha (waning phase of the moon) of the Ashada month is known as Yogini Ekadasi. The glories of Yogini Ekadasi are mentioned in the as explained by to king Yudhishtira.
The most glorious yet the most difficult of all the Ekadasi fasts falls during the Shukla paksha (waxing phase of the moon) of the Jyestha month. This particular Ekadasi derives it's name “Nirjala” to mean “without water” and is thus, the most austere of all the Ekadasi fasts. The glories of Nirjala Ekadasi are mentioned in the .