Occasionally, people will have to apply it a second time later that year. Another example is the post-emergent weed killer, Roundup (glyphosate), a non-selective herbicide that you may use (with ...

Saunders explains that Roundup, especially the Roundup Weed & Grass Killer and other general use formulations, may do more harm than good to a lawn. He says, "It doesn't just take out weeds — it ...