President Pranab Mukherjee, Vice President Mohd. Hamid Ansari and Prime Minister Dr Manmohan Singh have greeted the nation on the occasion of Onam. In a message, Mr Mukherjee said this unique festival brings out the rich cultural heritage of Kerala in its best form and spirit. In his message, Dr Mammohan Singh said, Onam is an occasion to celebrate the splendour and bounty bestowed by nature.