Cannabis plants worth £200,000 have been seized from a house in Yeovil.
Officers found 198 plants at a detached house that had been converted into a cannabis factory in Boundary Close.
A 33-year-old man is in custody for questioning on suspicion of drugs and immigration offences.
The area’s beat manager PC George Pettingell said: “We’re very grateful for help from the public in being our eyes and ears identifying this suspected cannabis factory.
“We take drugs misuse and its associated crime and anti-social behaviour very seriously. If you have any information about drugs in your community, please call us on 101.”