2,4-D is generally grass friendly because it has been designed not to harm grass but to kill broadleaf weeds. However, you will need to take extra care when using it on turfgrass, because there are some that you shouldn’t use it on, read the label on your product to find out. It is also advised that you take precautions when using 24D weed killer on Bermuda grass, because during the month of January, it’s in its dormancy stage, and 2,4-D can kill it around this time. The only grass that 2,4-D will kill is nutgrass.