A Lincolnshire farmer has been jailed after cannabis worth nearly £50,000 was discovered at his farm.
The crop was found on the Angel Wells Farm at Castle Bytham near Grantham by firefighters.
Iain Brown, 52, was arrested in March after a sophisticated lighting and heating system was found.
Recorder William Harbage accepted Brown had no active part in the operation, but because he did nothing after finding the crop, prison was only the only option.
Brown told Lincoln Crown Court that he had rented the barn out to another man and said he had only discovered in July 2002 that cannabis was being grown there.
Brown claimed he tried to get the tenant to remove the plants but his family were then threatened.
Brown, of Morkery Lane, Castle Bytham, admitted permitting his premises to be used for the production of cannabis between 1 March 2002 and 14 March 2003.