A marijuana grow-operation capable of producing 20,000 mature plants every year, has been shut down in the B.C. Interior.

Cpl. Chris Newel says RCMP officers moved in on Tuesday and served a warrant at the farm, near Barriere, B.C., 420 kilometres northeast of Vancouver.

He says 2,600 pot plants were seized from a two-storey horse barn and Mounties just missed thousands more, which they believe had been harvested only weeks earlier.

Newel says the barn was also wired with heavy-duty electrical equipment and it appears the operation was built specifically for growing marijuana.

Investigators estimate as many as 5,000 pot plants could have been grown in the barn at any one time.

A 45-year-old man has been arrested and is due to appear in a Kamloops, B.C., court in October.