Police in Preston said they discovered four cannabis farms in just two days in the city.
On Friday, as a result of an investigation and tip offs, officers gained entry into three properties on St Luke’s Place in the St Matthews area and discovered grows which contained around 280 plants.
Evidence was also found that the electricity had been bypassed.
On Thursday, the team entered a property on Stefano Road in Fishwick and seized around 55 plants, again with the electricity bypassed.
No arrests have been made at this stage and investigations are continuing.