Kay from Rochester, Wa writes
Mulch was used to keep weeds from spreading or does it need to be directly on soil to work?
Casoron 4G Herbicide is best applied directly to soil and then watered in to create the barrier needed to prevent weeds from emerging. To help get the Casoron granules to the soil in mulched you must heavily irrigate the area after the application. Casoron is a mild soil sterilant, so it is very important not to put it in areas where it will contact desirable plants or in areas where you will soon want to grow new plants.
Answer last updated on: 04/01/2019
