Cannabis with an estimated street value of £35,000 has been found at a farm in Mellor, near Samlesbury.
Police raided the property in Mellor Lane at around 10.30am on Tuesday after receiving information from members of the public.
Officers discovered 89 plants in a garage and a large shed.
A 65-year-old man was arrested on suspicion of producing cannabis.
Det Insp Mark Winstanley said: “We had a lot of reports from people who had noticed a strong smell of cannabis coming from the address.
“It was very large for such a rural location and I hope it sends a message out to the public that the police will act on their concerns.”
Call police on 101 or Crimestoppers anonymously on 0800 555 111.