by Connie Oswald Stofko Stop weeds before they even pop out of the ground–that’s what pre-emergent herbicides do. Pre-emergent herbicides act on seeds at the germination stage. Corn gluten meal is an organic pre-emergent herbicide. There are synthetic pre-emergent herbicides, too. These can work well on grass seed and broad-leaf seeds. However, like every herbicide, they don’t kill every type of weed. They don’t kill existing weeds. And they don’t work on plants with tap roots, such as dandelions. They…...


