Three men have been jailed for growing cannabis at several houses, including some in Kilsby and Weedon.
43 year old John Tyson, and Neil Moloney, who's 36, got six years and five and a half years respectively.
29 year old Neil Murray was given a 12 month sentence during the same hearing at Northampton Crown Court.
The case which concluded at Northampton Crown Court last Friday was part of a retrial. The first trial lasted for over 13 weeks and ended in January 2017 with brothers Paul Heath, 36, and Gavin Heath, 30, jailed for a total of 12 years for their part in the running of these cannabis factories.
A spokesman from Northamptonshire Police said: “We welcome the sentences handed down on Friday and hope they will serve as a deterrent to others thinking of becoming involved in this kind of criminal activity.
“We take the production of illegal drugs extremely seriously at Northamptonshire Police and will always pursue those suspected of making money in this way in order to bring them to justice.”