Fertilome Green Grass and Weed Killer RTU is a versatile, non-selective herbicide designed to control and kill unwanted grass, moss, weeds, and algae all year round. The product works by suppressing the growth of perennial and bi-annual weeds. Its fast acting mode of action is suitable and efficient for spot treatment in lawns, bark mulch, raised beds, containers, and any facilities holding trees, shrubs, or flowers. For best results, apply Fertilome Green Grass and Weed Killer RTU when weeds are young and less than five inches in size.