Preen Southern Weed Preventer Plus Fire Ant Flea and Tick Killer provides Gardeners with a solution for their two biggest problems – weeds and insects. This product is specially formulated for hot Southern climates and combines a proven weed preventer [Dithiopyr] with a powerful insect killer [Bifenthrin] to prevent weed seeds from germinating and to kill harmful insects on contact. So block weeds from ruining your gardens kill foraging Fire Ants for up to 6 months and get more enjoyment from your gardening.