RCMP seized 700 marijuana plants from two properties in the RM of St. Andrews on Thursday.
The investigation into the grow-op began in July, and included one residence and an outdoor area on Hall Road near Petersfield, Manitoba.
Police also seized a tractor, quad, truck and firearm during their raid.
A 43-year-old Petersfield man was arrested on Highway 9 in between Clandeboye and Petersfield and will face charges drug-related charges along with careless storage of a firearm. He remains in custody.
Police continue to investigate.