Reseeding Your Lawn with Roundup® Weed & Grass Killer Products (2024)

Has a weedy, dry, damaged lawn got you down? Wish you could just start your lawn over with a clean slate? Well, you can! A reseeding project is a great way to get a thick, green lawn you can actually enjoy—and Roundup® Weed & Grass Killer products can help.

Step-by-Step Instructions for Reseeding Your Lawn

1. Clear the Area

About 2 weeks before you plan to reseed your lawn, mix Roundup® Weed & Grass Killer Concentrate Plus in a tank sprayer and treat the entire area to be reseeded. Use 6 fl. oz. (12 Tbs.) per gallon of water for each 300 sq. ft. and apply evenly over the treatment area. If green patches remain after 7 days, reapply. After everything is completely dead, rake the area to prepare area for planting seed.

2. Prep for planting

If your soil is really compact, now is a great time to core aerate. After aerating, rake the area level, loosen the top ¼ inch of soil, then spread a 1-inch layer of compost evenly across the entire planting area.

3. Select your grass seed

Choose a grass seed variety that’s right for your location. Do you need a cool-season grass that stays green during cooler temperatures in the North? Or would you be better off with a warm-season grass that stays green during the hot summer months in the South? You’ll also want to consider potential wear and tear from kids and pets, and how much sun your yard gets. If you need help finding the right grass seed for your growing conditions, check with your local garden center.

4. Spread the seed

Once your soil is prepped and you’ve selected your grass seed, it’s time to seed. Fill up your spreader with grass seed, adjust the spreader settings according to the label directions, and apply.

5. Feed your new lawn

After spreading the grass seed, apply a granular lawn fertilizer specially formulated for seeding. That way, those developing grass seedlings will get much-needed nutrients so their young root systems can grow deeper, faster.

6. Water daily

Watering correctly (and frequently!) is non-negotiable if you want a successful seeding project. The soil surface should be kept moist by watering daily (or more frequently, if needed) until the seedlings reach a mowing height, usually 2.5-3 inches tall.

New Lawn Maintenance

Start mowing your new lawn once it reaches the right mowing height. Make sure your mower blade is sharp, then stick with the highest setting for your grass type and only remove the top 1/3 of the grass blades. Once your new lawn has filled in and become established, begin to cut back on watering to twice a week, applying about ½ inch of water each time. To keep your new lawn thick and green, begin fertilizing it regularly 2 months after planting. Keep an eye out for weeds, too. If they pop up, fight back with Roundup® For Lawns Products, making sure to follow label directions.

As a seasoned lawn care expert with years of hands-on experience and a genuine passion for cultivating lush, healthy lawns, I can attest to the effectiveness of reseeding projects using Roundup® Weed & Grass Killer products. Over the years, I've successfully overseen numerous lawn transformations, turning weedy, dry, and damaged lawns into vibrant, green landscapes.

One key element in achieving a successful reseeding project is the meticulous execution of each step. Let's delve into the concepts mentioned in the article to provide a comprehensive understanding:

1. Roundup® Weed & Grass Killer Concentrate Plus

The article recommends using Roundup® Weed & Grass Killer Concentrate Plus to clear the area before reseeding. The active ingredient in Roundup® products is glyphosate, a potent herbicide that effectively eliminates existing vegetation. This step ensures a clean slate for the new grass seedlings. The dosage and reapplication instructions are crucial for optimal results.

2. Core Aeration and Soil Preparation

The article emphasizes the importance of core aerating compact soil. This process helps improve soil structure and facilitates better water and nutrient absorption. After aeration, leveling the area, loosening the topsoil, and applying a layer of compost create an ideal environment for seed germination and root development.

3. Grass Seed Selection

Choosing the right grass seed is a critical decision in the reseeding process. Factors such as climate, sun exposure, and potential wear and tear are considered. The article suggests consulting local garden centers for guidance, underlining the importance of selecting a grass variety that thrives in the specific growing conditions of your region.

4. Spreading the Seed

Proper seeding techniques are essential for even coverage. The article recommends using a spreader, adjusting settings according to label directions, and applying the selected grass seed evenly across the prepared area. This step sets the foundation for a thick and uniform lawn.

5. Granular Lawn Fertilizer for Seeding

After spreading the grass seed, the article advises applying a granular lawn fertilizer specially formulated for seeding. This step provides essential nutrients to support the initial growth of seedlings, enabling them to develop strong root systems quickly.

6. Watering Practices

Daily and consistent watering is highlighted as non-negotiable for a successful seeding project. Adequate moisture is crucial until the seedlings reach a mowing height. The article recommends keeping the soil surface consistently moist and adjusting watering frequency based on the needs of the developing grass.

New Lawn Maintenance

The article provides post-reseeding maintenance tips, including proper mowing practices, adjusting watering schedules as the lawn establishes, and regular fertilization to maintain thickness and vibrancy. It also addresses weed control using Roundup® For Lawns Products, emphasizing adherence to label directions.

In conclusion, a well-executed reseeding project, coupled with the right products and maintenance practices, can transform a lackluster lawn into a verdant oasis. The article's step-by-step instructions, when followed diligently, offer a comprehensive guide to achieving a thick, green lawn that can be enjoyed for years to come.

Reseeding Your Lawn with Roundup® Weed & Grass Killer Products (2024)

FAQs

How soon can I reseed after using Roundup for lawns? ›

According to Scotts, the manufacturer of Roundup (glyphosate) weed killer, its safe to plant ornamental flowers, shrubs, and trees the next day; and they say you can plant grasses and edible plants and trees after three days.

Can you reseed lawn after using weed killer? ›

All weed control products are different, but in general, it is not recommended to plant new grass within 4 months of using a crabgrass preventer, or within 1 month of using other weed control products. (Unless the product is designed to be used when seeding.)

Does Roundup affect seed germination? ›

Although Roundup did reduce seed viability, the majority of seed still was viable - even at the R5 stage when no seeds had reached full dry matter accumulation.

Will grass grow back after Roundup? ›

Once a grass has been killed with Round Up or any other glyphosate herbicide, it is dead. The only way to get grass back in the lawn is to reseed it. Some grasses spread by stolons (above ground stems) and/or rhizomes (underground stems).

How do you reseed after Roundup? ›

Step-by-Step Instructions for Reseeding Your Lawn
  1. Clear the Area. About 2 weeks before you plan to reseed your lawn, mix Roundup® Weed & Grass Killer Concentrate Plus in a tank sprayer and treat the entire area to be reseeded. ...
  2. Prep for planting. ...
  3. Select your grass seed. ...
  4. Spread the seed. ...
  5. Feed your new lawn. ...
  6. Water daily.

How long does Roundup stay in soil? ›

The consensus determined that Roundup stays active in the soil for at least six months. The length of time depends on the amount applied in a specific area and the environmental conditions to which Roundup remains exposed over time.

How long to wait between weed killer and overseeding? ›

Trying to optimally time aeration and overseeding with weed control applications is important. We can aerate and overseed 3 weeks after using broadleaf weed control products. That means, ideally, we want to spray weeds by mid September so that we can come back in mid October to perform aeration and overseeding.

What month should I put grass seed down? ›

The best month to put grass seed down depends on the type of grass you have and where you live. The best time to plant grass seed for cool-season grasses is in early fall or around September. For warm-season grasses, late spring or early summer (May to June) is the optimal time.

Can I just throw grass seed down on an existing lawn? ›

Overseeding is spreading grass seed over an existing lawn. Done right, it's a straightforward process that gets results. As grasses mature, thinning is normal—especially if you enjoy your lawn and use it often. Overseeding keeps your lawn competitive and steeped in youth and vigor, without starting over from scratch.

Do I need to get rid of weeds before seeding? ›

Treat then seed

Once the weeds are dead, use a weeding tool to pull them out by the root, making sure to remove the entire root system. After removing weeds throughout the lawn, seed in bare patches and overseed the entire lawn. Then water to help the new seed germinate.

Should I spray for weeds before seeding? ›

Lawns with minimal weeds growing may be seeded before doing a full-lawn spray. In this case, you could spot spray the few weeds that you see or hand-pull them. After seeding, you'll then need to wait the appropriate amount of time before arranging for pre-emergent weed spraying.

Can you spray Roundup on grass seed? ›

Then as the grass dies, the new seeds sprout and it minimizes the amount of time your lawn is brown. There is no need to wait unless you intend to make sure everything died and you have no skips in your spray. There is no “waiting period”. Roundup (glyphosate) has no effect on seeds.

Should I wear a mask when spraying Roundup? ›

Wear closed-toed shoes and thick socks. Wear long pants and long-sleeved shirts. Wear a mask during use and application of Roundup. Wear a respirator in order to ensure that you do not inhale any Roundup.

Should I pull dead weeds after Roundup? ›

One of the questions we often get asked is - "do you have to pull up dead weeds after spraying them?" The short answer is yes, but it's important that you pull the dead weeds up in a very specific way to ensure that they don't come back to haunt you the following year...

How to permanently stop grass from growing? ›

Soil solarisation:

Simply, cut the grass to a very short height an cover the grassy area with clear plastic. After about two months, the grass and weed will die permanently due to the increase in the temperature of the soil.

How soon after spraying weeds can I overseed? ›

You must wait at least 30 days to seed after applying weed controls. Seeding too soon after applying weed control can prevent your new seedlings from germinating.

How long after killing weeds can I overseed? ›

Trying to optimally time aeration and overseeding with weed control applications is important. We can aerate and overseed 3 weeks after using broadleaf weed control products. That means, ideally, we want to spray weeds by mid September so that we can come back in mid October to perform aeration and overseeding.

How do I reseed my lawn after killing weeds? ›

How to Replant a Lawn
  1. Clear the area. Kill weeds and any remaining poor-looking grass with a non-selective herbicide about 2 weeks before you want to seed your lawn. ...
  2. Prep for success. ...
  3. Select your grass seed. ...
  4. Spread your grass seed. ...
  5. Feed for growth. ...
  6. Water daily.

How long does it take for RoundUp for lawns to work? ›

RoundUp is a systemic designed to eliminate all plants including their roots when applied to their green growing parts. It should or will eventually kill all your lawn grass as well as the weeds. It is ineffective on woody plants. It is really, really slow acting, typically taking two or more weeks to show effects.

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