Officers raided a house in Kent Street on Saturday where they recovered around 110 cannabis plants.
The haul is believed to have a street value of around £60,000.
Two men have been arrested and police enquiries are ongoing.
Police bust drugs factory in Preston
More than 100 cannabis plants have been seized following a raid on a home in Preston.
By The Newsroom
Sunday, 28th January 2018, 3:32 pm
Updated Sunday, 28th January 2018, 4:45 pm