Why is this Ekadashi named 'Kamada'?

The Sanskrit word 'Kamada' signifies that which bestows ('da') all cherished desires ('Kama') in accordance with Dharma. It purges guilt while fulfilling noble earthly and spiritual ambitions.

Can someone observing this fast eat grains in the evening?

No. Like all authentic Ekadashi vratas, grains (rice, wheat, pulses) are strictly prohibited throughout the entire day and night. Fasting must be broken only on Dwadashi morning.

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Annual

Kamada Ekadashi

The wish-fulfilling first Ekadashi of the Hindu New Year on Chaitra Shukla Ekadashi