Cannabis worth more than £425,000 has been seized from four linked farms on Teesside.
Cleveland Police carried out raids at two properties on Leven Street in Middlesbrough on Wednesday.
It led them to an address on Cheltenham Avenue in Thornaby and another on Dorothy Street in Middlesbrough, which were raided on Thursday.
A total of £15,000 in cash and two vehicles, an Audi A3 and a Volkswagen Jetta, were also recovered.
Six men and one woman have now been charged with drug offences and are due to appear before magistrates.
The scale of these farms show that this was a highly organised production of illegal drugs."