AUSTIN (KXAN) — After months of surveillance and investigation, Austin police has issued an arrest warrant for a man accused of growing marijuana plants in a field in Northeast Travis County.

Detectives started monitoring 31-year-old Humberto Martinez-Castillo’s phone calls and text messages in May, according to an arrest warrant. Over the course of the next few months, detectives heard Martinez-Castillo talking to other individuals about a grow operation in a field in the 7300 block of East Parmer Lane near SH 130. To verify the location, police flew over the field in June and determined there were hundreds of marijuana plants in the area.

On July 8, police conducted a search warrant on the property and discovered two marijuana grow operations in the area. The plants ranged from seedlings to approximately 5 feet, continued in the court documents. Officials also discovered a generator and water pump used for irrigation. A total of 1,312 marijuana plants, weighing about 170 pounds, were seized in the search. After the marijuana was dried and weighed by police, the total amount was 13.2 pounds, making it a 3rd degree felony.

Once in custody, Martinez-Castillo faces a possession of marijuana charge.