How to Fix Grass Killed by Roundup

Roundup is an effective way to tackle stubborn weeds overtaking your lawn, but sometimes, it’s a little too effective. Sometimes, it takes down some of your pristine lawn in the process, causing yellowing or browning throughout the application area.

Key Points:

  • Roundup can sometimes kill parts of your lawn, causing yellowing or browning.
  • To fix the damage, you need to assess the extent of the damage and determine the root cause.
  • Once you know the cause, you can gather the necessary tools and materials and choose the right time to repair the damage.

While this is undoubtedly frustrating, there’s no need to worry! There are several methods to repair the grass killed by Roundup and restore your lawn to the beautiful, lush expanse it once was.

The process starts with removing the grass and improving the area with new seeds or sod, then finishes with implementing preventive measures to avoid application problems in the future.

Assessing the Damage

If you recently used Roundup Weed and Grass Killer, but instead of looking better, your lawn looks worse, you’ll need to evaluate the damage. You need to know the extent of the damage to fix it, so here are a few tips to help you in this process:

Identify the Extent of the Damage

The first step in assessing and reversing the damage is to identify the extent. Take a stroll around your yard and keep an eye out for areas where the grass is browned, yellowed, or dying. Note the size of the affected area and the severity of the damage in a journal or a notebook.

Keep track of the changes in the same notebook in the following days and weeks. This will help you keep track of progress and aid in determining whether you need to change your approach.

Additionally, pay attention to the type of grass you have on your lawn. Some types of grass, like Bermuda grass, will turn yellow but recover within a few weeks. Other types of grass, like Kentucky bluegrass, are more sensitive to Roundup and might require more extensive repairs.

Determine the Cause of the Damage

Once you identify and note the areas in desperate need of repair, you need to determine the root cause of the damage. While Roundup might be the first thing you think of, it might not be the true culprit. Or, maybe you used it improperly, resulting in issues.

So, did you apply the Roundup correctly according to the product label? Did you use the recommended amount? Did you apply it during the right time of day or year? Were there any inclement weather conditions that might have affected the application?

It’s essential to correctly determine the cause of the damage, as this will help you avoid making the same mistake in the future. You might need to tweak your technique or seek professional assistance if you misapplied the product.

Or, if the weather conditions weren’t in your favor, you might want to wait until the weather is predicted to be more favorable before future applications.

Assessing the damage and isolating the root cause of the problem are essential steps in fixing grass killed by Roundup. In determining the extent and cause of the damage, you can take the necessary steps to repair your lawn and prevent further damage.

Preparing to Fix the Damage

Once you determine the cause of the damage, it’s time to fix it. If you figure out your Roundup application is the culprit behind your suffering lawn, don’t worry! You can repair the damage and restore your lawn to its former glory.

Here’s what you need to do in preparation for repairing the damage:

Gather the Necessary Tools and Materials


First things first, you’ll need to collect the necessary tools and materials. Here’s what you’ll need:

  • Garden gloves
  • Shovel or spade
  • Rake
  • Grass seed (choose a type that works for your location and climate) OR sod (select a type that matches your grass variety)
  • Topsoil (as needed)
  • Fertilizer
  • Watering can or garden hose

Choose the Right Time to Fix the Damage

With your materials ready to go, you’ll need to pick the perfect time to repair your lawn. Ideally, you should wait at least a week after applying the herbicide. This ensures the herbicide has enough time to do its thing and kill the grass and weeds you applied it to.

If you start the process too soon, the herbicide might continue working, counteracting your efforts to repair the lawn.

Additionally, keep an eye on the weather forecast. Choose a time when the weather is pretty mild, and there isn’t a chance of frost. Ideally, you should repair your lawn in the spring or fall, as the weather tends to be cooler and the soil retains some moisture.

Fixing the Damage

Once you have your materials and the weather is working in your favor, it’s time to fix the damage. Follow these steps to begin the process of repairing your lawn:

Remove the Dead Grass

The first step in repairing the damage is removing the affected section. So, start by removing the dead grass. You can do this manually with a rake, but a sod cutter works better for larger areas.

As you remove the dead grass, ensure you remove the roots, too. This will create a more hospitable area for the new grass to grow, as there won’t be roots in the way of progress.

Ensure you smooth the area after ripping out the dead grass, as bumps create an uneven space when the grass fills in.

Reseed or Resod the Area

With the dead grass out of the way, it’s time to reseed or resod the area. If you decide to reseed the area, pick a grass variety that works well in your area. You can use the grass type you currently have, but if you’re unsure what varieties work best in your area, consult a local lawn care professional.

Spread the seed evenly over the prepared area, then cover it with a thin layer of topsoil or compost. The soil will protect the seeds and improve germination. Once you sprinkle the soil over the top, immediately water the area lightly to add moisture.

As the grass germinates and begins to grow, continue watering the area to keep the soil moist. Continue frequently watering the area until the grass is established.

On the other hand, if you opt for resodding the area, select a sod that matches the existing grass variety. Measure the affected area and cut the sod to fit. Lay the sod in the prepared space, pressing it firmly into the soil.

Water the sod immediately after laying it in place and keep it moist until the new grass establishes itself.

Water and Fertilize the Area

After replenishing the area with grass seeds or new sod, it’s essential to keep the site well-watered to promote vigorous and healthy grass growth. In the initial stages, you’ll need to keep the area moist through light and frequent watering.

Once the grass is established, water deeply once or twice weekly, depending on your climate and soil type. This should mimic the regular watering schedule you follow with the rest of your lawn.

In addition to watering the area regularly, it’s essential to supply vital nutrients to the new growth via fertilizer. Pick a fertilizer that suits your grass variety and apply it by following the instructions on the package. After fertilizing the area, thoroughly water it in to ensure the product soaks into the soil.

Preventing Future Damage

Now that your lawn is looking much better and the patchiness is a thing of the past, it’s crucial to take measures to prevent future damage. Here are a few tips to help you maintain a healthy lawn:

Use Alternative Weed Killers

If you’re worried about the potential effects of Roundup on your lawn or the environment, consider choosing an alternative weed killer. There are plenty of options that don’t require chemical cocktails, such as vinegar, boiling water, or corn gluten meal.

Each option has its merits and is generally safe for the environment. While you’ll need to be careful in the application process, they shouldn’t harm your lawn.

Take Precautions When Using Roundup

Roundup Concentrate Extended Control Weed & Grass Killer Plus Weed Preventer II

Roundup can be an excellent solution for tackling troublesome weeds, but it’s important to use it correctly and take precautions to minimize the risk of damage to your lawn. Here are a few tips:

  • Read and follow the label instructions carefully.
  • Only apply Roundup to areas where it’s needed.
  • Protect nearby plants from overspray by covering them with plastic or cardboard.
  • Avoid applying the product on windy days to prevent drift.
  • Clean up any spills or overspray immediately.

By following these precautions, you can minimize the risk of damage to your lawn and ensure that Roundup is used safely and responsibly.

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