Yeh Ekadashi keval Adhik Maas (Purushottam Maas) ke Shukla paksha mein aati hai. Adhik maas har teen varsh mein ek baar aata hai, isiliye yeh Ekadashi atyant durlabh, pavitra aur anant-phaldaayi maani jaati hai. Maanyata hai ki ismein kiya gaya vrat saamaanya Ekadashiyon se kai guna adhik punya deta hai.
Katha ke anusaar Haihaya-vanshi pratapi raaja Kritaveerya aur unki sundar, gun-sampann rani Padmini ko ek hi peeda thi — anek raaniyon ke hote hue bhi unke koi santaan na thi. Vansh aage badhaane waala koi uttaradhikaari na hone se raaja-rani atyant dukhi rehte the. Anek vrat, daan aur upaay karne par bhi jab santaan-sukh na mila, to rani Padmini ne ghor tapasya ka sankalp liya.
Rani van mein jaakar kathor tapasya karne lagi. Uski lagan dekhkar devarshi Narad — kuch kathaon mein apsara aur munijan — uske paas pahunche. Unhone rani ko maargdarshan dete hue kaha — "He devi, tum Adhik Maas ki Padmini Ekadashi ka nirjala vrat shraddha se karo. Yeh Purushottam Bhagwan ko atyant priya tithi hai; iske prabhav se asambhav manokaamna bhi poori hoti hai."
Rani Padmini ne pati sahit poore vidhi-vidhan se Padmini Ekadashi ka kathin nirjala vrat rakha, raat bhar Bhagwan Vishnu (Purushottam) ka jagran-kirtan kiya aur dwadashi ko vrat ka paaran kiya. Uski achal bhakti aur tapasya se prasann hokar Bhagwan Vishnu saakshaat prakat hue aur var maangne ko kaha. Rani ne santaan ka var maanga. Bhagwan ki kripa se rani ne aage chalkar mahaapratapi, sahasrabaahu putra Kartavirya Arjun ko janm diya, jo teenon lokon mein apne paraakram ke liye prasiddh hua.
Seekh: Padmini Ekadashi sikhaati hai ki Purushottam Maas mein shraddha aur sanyam se kiya gaya yeh durlabh vrat asambhav-si manokaamnaon ko bhi poora kar deta hai. Dridh bhakti ke aage Bhagwan svayam prakat ho jaate hain.