by Nadeem Waqif (Id by Varun Sharma) (Inserted by J.M.Garg) (For more images & complete details,
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Ornamental plant for ID, Sikkim NAW-JUL16-12 : 4 posts by 2 authors. Attachments (1)
Kindly identify this ornamental plant growing in a private property in South Sikkim, photographed in may 2015.

Try with comparative images at Araceae

May be some Zantedeschia species/ hybrid as per google search

Plant appears to be deciduous and leaves seem to be cuneate not hastate or cordate at base. Therefore this should be Zantedeschia rehmannii Engl. (Pink Calla Lily).