John from Ames, Ia writes
I heard the product stays active even after composting and may harm my garden plants.
We contacted Syngenta which is the manufacturer of the product. According to Syngenta, once you have cut your grass, you would need to put the clipping in the compost pile and let it sit for at least 30 days. After 30 days the chemical has broken down in the clippings and can be used in other areas of the yard where you are growing garden plants.
Answer last updated on: 06/02/2013
