Border Patrol police and Forest Reserve officers arrested elderly Sommai Tadkaew at his four-rai farm in Tap Phut district on Monday morning (November 26).
The officers found the 100 marijuana plants spread around the farm, hidden among the corn plants in an effort to fool the police.
A police spokesman said Mr Sommai was known to sell marijuana in Tap Phut and nearby districts, and that he had confessed to selling some of the drug to police agents.