Herbicide carryover happens when products used to kill broadleaf weeds remain active in the clippings. When these treated grass clippings are used as mulch, rain and irrigation water can release the weed killer allowing it to leach into the soil and affect trees, shrubs, flowers and vegetable plants.

Is it good to put grass clippings around trees?

Mowed grass clippings are a free and simple way to mulch your trees. Mulching trees will help keep the soil moist, which cuts down on the need to water. Grass clippings might also prevent weeds from sprouting around the base of your trees, which can improve the curb appeal of your home.

What is the best thing to do with grass clippings?