Solomon Island police seized around 4500 marijuana plants this week believed to be worth thousands of dollars on the local market.
The plants were being grown along the Barande River in north east Guadalcanal.
Police say they noticed an increase in the sale of marijuana in the area with some being transported for sale in the capital and traced it back to the farm.
They are warning the public that anyone found growing, selling or assisting in the trading of illegal drugs can and will be prosecuted.