Police have seized around 400 cannabis plants from a huge farm on the outskirts of Newquay.
The plants were located in a large poly tunnel - each was at least 6 feet tall.
Four people were arrested on suspicion of being concerned in the production of cannabis.
Inspector Dave Meredith said he hoped it would put more pressure on drug dealers:
The cannabis plants were being grown in a large poly tunnel. Credit: Devon and Cornwall PolicePolice hope the raid will deter drug dealers. Credit: Devon and Cornwall Police