Roundup targets the plant's leaves and stems. It doesn't linger forever in the soil like some other scary chemicals. This is key: the poison kills what it touches, but it doesn’t set up camp to ruin your future grass babies.
The chemical, glyphosate, breaks down relatively quickly. We’re talking days or weeks, not years. So the dirt is usually fine. The problem is the dead grass currently occupying prime real estate.
The Waiting Game: When Will Green Pop Up?
If you killed annual grass (the one-and-done kind), new seeds will sprout as soon as they land. It’s like evicting a tenant and finding squatters the next week. You might see green fuzz in as little as two weeks.
But if you zapped perennial grass (the kind that lives for years), it’s a different story. That grass had roots deeper than your uncle’s conspiracy theories. It takes longer. You’re looking at a few weeks of ugly silence before the roots muster a comeback.
Here’s the sneaky part: Roundup doesn't kill every single root. Some stubborn ones take a nap and wake up grumpy. You'll often see patchy resurrection—like a zombie movie, but with turf.
