Marlin from Clarion, Iowa writes
Since Trimec 992 Broadleaf Herbicicide is not labeled for use around edible plants, it would not be recommended to use grass treated with this product for mulch in a garden with edible plants such as vegetables and herbs. In an ornamental bed, we would recommend waiting at least 3 weeks from the product application before using the treated grass in mulch.
Answer last updated on: 05/11/2016