PENN TWP — Police today made a harvest of 150 marijuana plants.

The plants, 12 to 18 inches tall, were found growing in a cornfield off Hicks Road in Penn Township, unbeknownst to the property owner, authorities said

A tip Wednesday led police from Penn and Middlesex townships to the 500-acre field. Officers did a helicopter fly over today.

Officers spotted row after row of the illegal crop, said Middlesex Township Police Sgt. Randy Ruediger.

Police believe the marijuana was the product of seedlings started indoors and only recently transplanted outside.

“Some corn stalks were removed and replaced with marijuana plants,” Ruediger said. “No one knew the plants were there because they were hidden by the weeds and corn stalks.”

Officers pulled the plants and took them to the Penn Township police station to be destroyed.

Butler County Detective Tim Fennell, who heads the county Drug Task Force, was hard pressed to put as valued on the plants.

“At maturity, maybe each one could produce $500 or $600 worth of marijuana,” he said.

Ruediger said that the investigation was closed, and there would be no arrests.

“There’s not enough to go on,” he said, “in the way of suspects.”