Mary from Dorchester, writes
Unfortunately, Hi-Yield 2, 4-D Selective Weed Killer is not labeled for St Augustine. In fact according to the product label it can cause injury to this type of grass. We would recommend using a product such as Trimec Southern Broadleaf Herbicide which is labeled for St Augustine as long as it is not Floratam.
Answer last updated on: 06/07/2017