Pot growers beware.

Police say they’ll keep an eye on the secluded prairie where about 1,500 marijuana plants were discovered on the Southeast Side earlier this week. And authorities said they put a “wood-chip composite” on the property to inhibit the growth of any vegetation.

Officers in a police helicopter spotted the pot farm Tuesday at 107th and Stony Island. The plot was the size of two football fields and the rows of 6-foot-tall pot plants were worth at least $7 million, police said. The plants were cut down, covered with diesel and burned by the Chicago Police Bomb and Arson Section.

Police said someone was watching over the crop. Officers found sleeping bags, food and other supplies nearby. A man was seen running from the plot, but no one’s been charged.

Cars and trucks rumble along the Bishop Ford Expy., just west of the marijuana plot, prompting police Supt. Garry McCarthy to call the growing operation “brazen.” The investigation is ongoing, said Nicholas Roti, chief of the police Organized Crime Bureau.