Whispered Weedy Secrets
Pre-mixed topsoil from landscape supply yards often contains weed seeds. Trifluralin (contained in products such as Preen Garden Weed Preventer), on the other hand, is a pre-emergent, nonselective herbicide that will kill grass seeds as well as weed seeds and is only for use in established gardens. Combination Herbicides (such as Ortho Ground Clear) contain …