A man was taken to hospital after farmers from Blenheim and Taihape started fighting in Blenheim early yesterday, say police.

Constable Andrew Holdaway, of Blenheim, said a 32-year-old man was taken to Wairau Hospital after being knocked unconscious.

The two groups of farmers started fighting at the intersection of High St and Symonds St just after 2am.

Police arrived to find three Blenheim farmers and a group of Taihape farmers, each blaming the other for starting the fight.

Both groups were intoxicated and "a little worse for wear", Holdaway said.

Police helped the farmers back to their accommodation after the 32-year-old had been taken to hospital by ambulance.

St John team manager Rebecca Lee said he had moderate head injuries.

A Wairau Hospital spokeswoman said yesterday the man was in a stable condition.