Seeding After Weed B Gon


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Weeds can ruin a lawn, and adding weed killer at the wrong time can ruin it. Learn how long after weed killer can I plant grass seed, to give you a great lawn How Long Does Weed B Gon Take to Dry? Weed-B-Gon is a very popular weedkiller since it tackles over 250 different kinds of weeds. It is also effective on crabgrass ( we’ve reviewed the best

How Long After Weed Killer Can I Plant Grass Seed

One of the main things that stands out in a lovely garden is a lawn that looks lush. You can cut these on a regular basis, you can add fertilizer, and you have a sea of green that looks well-tended to and healthy.

A beautiful lawn makes a great place to spend time in the garden, for kids to play, and to hang out during the summer.

Unfortunately, there is one thing that can ruin this appearance, and that is the emergence of weeds. Treating these isn’t straightforward for several reasons.

You can find different kinds of weed killer, the time you need to apply weed killer can change, and knowing when you can sow your lawn after using any weed killer products is vital.

Getting any of these wrong can ruin your lawn, or you can find you sow your lawn, and the seeds don’t grow because of weed killer traces.

Here, we look at seeding grass after applying weed killer, and anything else you ought to know about growing a healthy and vibrant lawn.

Lawns and Pre-Emergent Herbicides

When spring comes, it is this time when weeds begin to raise their ugly heads. It is a chore that every gardener faces, and can be a frustrating one.

Tending to weeds comes at precisely the same times when gardeners want to seed their lawn to fill in any thin patches or to ensure they have good growth before the lawn mowing commences.

One of the significant issues with pre-emergent herbicides is they don’t care what plant they are sprayed on. They will prevent grass seed from growing as much as any weed.

  • A natural weed killer Made from ocean salt water, commercial strength food grade vinegar and soap.
  • Our non selective ready to spray Natural Weed & Grass Killer is not normally used on the lawn.
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How to Add a Pre-emergent Weed Killer

One of the reasons gardeners seed their lawns is that thick grass can help to retard the growth of weeds.

The weed seeds are prevented from reaching the soil, and thus, they can’t proceed with their germination.

Here we will see how you can apply a pre-emergent herbicide week killer to your lawn.

Items You Need

  • Garden hose (Find the best garden hose here)
  • Topsoil
  • Garden spreader
  • Rake
  • Grass seeds that are the same as your current grass

Rake your lawn so you can remove dead grass and roots. Preemergent’s should take care of any weeds before they take hold. You need to apply this in the spring before the temperature reaches the range of fifty Fahrenheit and above.

You will need to wait for the required period before you reseed your lawn.

Check the seed packet for the over-seeding quantity.

Add half of the recommended quantity of seeds to your seed spreader.

Moving backward and forward in rows, walk across your lawn. Once you have done this in one direction, add the remaining half of the seeds. You can now spread these in a perpendicular pattern to the first to complete your overseeding.

You also need to spread a thin 1/4-inch layer of topsoil across the top of your lawn and make sure it works its way between the current blades of grass.

Take your garden hose, but be careful not to drag it across your lawn. Water your lawn to a depth of two inches. (Learn How To Plant Poppy Seeds)

Do this daily, until new grass blades grow. At this point, you can reduce watering to twice per week. The depth also only has to be one inch deep.

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How Many Times Can I Use Weed Killer on My Lawn?

The answer to this will depend on the weed killer you use. You must read the labels at the time of purchase and before use. You can find some weed killers that only require one treatment per year.

However, some single-use weed killers, you can use in combination with another. By doing so, you can treat your lawn twice in one year. Doing this does apply to the entire lawn coverage and not spot treatments.

Aside from this, as long as you select weed killers for your lawn that comes with different active ingredients to each other, you can have another couple of treatments each year.

By following these treatments, you can find you only have to do so for the first couple of years. Treatments to this extent can tackle establish weeds, and possibly form the third year onward, a treatment in September or the early fall can be all you need to do for a full treatment.

Spot weeding will be required with a spot weed killer in the spring and summer. For a well-established lawn care practice, you may see you don’t need to do an all-over treatment for several years.

If you sow feed on your lawn first, you will need to let the feed work for one to two weeks before you treat the weeds.

One other thing to do is be sure not to water your lawn after you use weed killing products. This dilutes it and prevents it from doing its job.

How Long Do Weed Killers Last in Soil?

It doesn’t matter if you are sowing grass seed, laying turf, or spot weeding. You do need to know how long weed killers remain in the soil. This can affect plants, grass seed, or anything else that is growing in that particular area.

A period will follow, where you can’t do anything. It is here the weeds should be dying. There aren’t many plants, which are hardy enough to survive a good dose of weed killer, and grass can have a much tougher time.

If there are any traces in the soil, you will find nothing will grow. It is for this reason they have designed most weed killers to evaporate within twenty-four to seventy-two hours. In theory, and if you follow the directions, it is possible to seed your lawn, or plant anything after two or three days.

In fact, by law, most of the commercially available weed killers you purchase from a local garden center are required to break down in the soil inside two weeks.

One example being glyphosate, where it can break down in a shorter period of two days or up to the maximum depending on the product.

Using Roundup On Your Lawn

One of the most common weedkillers you can purchase is Roundup. It was introduced to be a broad-spectrum herbicide.

Its aim was to kill weeds while being safe to use, and it wouldn’t remain in the soil to prevent further growth.

One of the primary ingredients in Roundup is glyphosate, which in its own right, is one of the most widely used herbicides in near enough every country.

The solution is pre-mixed, so it is a matter of spraying. This may come with a spraying wand depending on the pack, and it does help with directing the herbicide where to go.

One of the crucial things for gardeners who want to use it on their lawn is how they use it, and how often they apply it.

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How Long After SprayingCan I Plant Grass Seed?

Being a systemic herbicide, the leaves of the weeds will absorb Roundup, where it circulates through the weeds until it reaches the roots.

The manufacturers claim there is no leeching into the soil, and any of the chemicals that washes into the earth won’t last for more than 24 to 48 hours.

The issue with Roundup is it is a non-selective herbicide, meaning gardeners do need to take care of where they spray it.

If there is any wind, this can blow it across a lawn, and it will have a detrimental effect on the grass it lands, as well as where it was applied.

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One thing to note is there are other Roundup products, which contain diquat, which is a pre-emergent herbicide.

If these products are used, then growth can be almost non-existent for nearly four months.

Re-seeding your lawn can be a waste of time, and you may not find out until it is too late. (Read Can Grass Seed Go Bad)

Gardeners can also apply this weed killer at certain times of the year, depending on the kind of grass they have. Along with this, you can find it affects how quickly you can get to reseeding your lawn.

If you are planting cool-season grasses or turf, the best time for doing so is in the fall or early spring. Warm-season grasses, on the other hand, you ought to plant grass seed before August or September.

If you apply Roundup in the fall, you will need to wait until the following spring before you seed warm-season grasses.

If you are planting cool-season grass, you proceed with seeding your lawn after using Roundup in the summer, in October once the weather cools.


For the most part, the chemicals found in weed killers aren’t a problem for the home gardener after they have evaporated. Most weed killers used to come with a relatively short residual life.

However, you do need to read the label, directions and warnings on the packages before use.

Manufacturers will provide instructions on how to apply the weed killer, and when you are safe to grow plants or planting grass after killing weeds or preventing weed seeds from growing altogether.

How Long Does Weed B Gon Take to Dry?

Weed-B-Gon is a very popular weedkiller since it tackles over 250 different kinds of weeds. It is also effective on crabgrass (we’ve reviewed the best crabgrass killers here).

The problem with using herbicide on your lawn is that it may affect more than just the unwanted weeds. The chemicals need some time to break down before it is safe for you, your children and pets to enjoy the lawn again.

Read on to find out more about how long Weed-B-Gon takes to dry and how to apply it safely.

What Is Ortho Weed-B-Gon?

Weed-B-Gon is a popular chemical herbicide for lawns produced by the Ortho brand. One of the main reasons why many households prefer this brand is that it claims to kill over 250 types of weeds, including most broadleaf weeds.

Another perk of this weed killer is that it does not affect lawn grass species. This is an impressive feat because it attacks weeds down to the roots.

Weed-B-Gon comes in the form of a liquid and must be diluted to get the appropriate concentration for the specific lawn. It is one of the easier herbicides to spread on a lawn.

How Weed-B-Gon Works

Ortho Weed-B-Gon is the type of herbicide that attacks weeds at the root. After application, the chemicals sink down into the soil to reach the roots.

While the roots are suffering damage, the leaves and stems that you see above ground suffer, as well. Weeds will start to wilt and yellow as the herbicide goes to work.

You may see initial effects after just 10 hours but it can take up to two weeks for the weeds to truly die. The weeds should not grow back until the following growing season in the next year.

How to Apply Weed-B-Gon: 6 Steps

Like most herbicides, there is an appropriate time to apply them. This is because the chemicals are more effective during specific stages of weed growth and during certain weather conditions.

Here are a few tips on how to apply Ortho Weed-B-Gon so that it is most effective.

1. Wait for the Weather to Cool Down

Too hot temperatures can cause the grass to burn. Also, the chemicals might evaporate too quickly – it requires time to sink into the soil and reach the weed roots.

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The best time to apply Weed-B-Gon is when the temperature is between 45°F – 85°F. Sunny days are preferable but it more important that it won’t rain for the next 24 hours.

2. Apply Long Before Rain

Ortho Weed-B-Gon should be applied approximately 24 hours before a rain shower is expected. This should give it enough time to soak into the soil and prevents the rain from washing away the active agents.

3. Don’t Apply Weed-B-Gon More than Twice a Year

Ortho Weed-B-Gon is a powerful herbicide and the chemicals stay in the soil for a long time, even after the lawn already appears dry. Applying too much and too often can damage your lawn, instead of protecting it from weeds.

Weed-B-Gon takes about 14 days to work so wait at least two weeks to see if the first dose has had an effect. If there are no results after 14 days, it is possible to apply Weed-B-Gon for a second round.

This herbicide should not be applied on a lawn more than twice a year. So, if the weeds are not killed after 28 days, other measures may be needed.

4. Stay Off the Lawn Until It Is Dry

Ortho Weed-B-Gon takes approximately 24 – 78 hours to dry, depending on the weather conditions. Keep yourself, children and pets off the lawn until all the herbicide has evaporated.

5. Wait 14 Days Before Planting Grass Seed

Herbicides like Weed-B-Gon leave traces in the soil since their job is to attack weeds from their roots. These same chemicals may be safe for many already established grass types but it does stop new seedlings from germinating.

Avoid wasting your time, energy and money on grass by being patient after applying Weed-B-Gon. Wait at least 14 days after applying herbicide before sowing grass seeds.

6. Only Apply Ortho Weed-B-Gon to Lawns

Ortho Weed-B-Gon should only be applied on grass lawns. It is not suitable for areas where shrubs, trees, flowers or fruit growing plants will be planted.

Although herbicides are meant to break down, trace chemicals may still be found in the soil long after the standard of 14 days has passed.

Frequently Asked Questions:

How Long Does Weed-B-Gon Take to Work?

Weed-B-Gon starts working after just 10 hours, depending on the application method and weather conditions. After the first 10 hours weeds may start to wilt and yellow but it takes a further 1 – 2 weeks for the weeds to completely die off.

Weed-B-Gon Doesn’t Work. Why?

Weed-B-Gon may not work for several reasons including incorrect application method, unsuitable weather conditions and a resistant species. Make sure to carefully follow the instructions for the best results and prevent damage to the lawn.

Does Ortho Weed-B-Gon Kill Grass?

If applied incorrectly, Ortho Weed-B-Gon can kill certain grass species. Weed-B-Gon is safe for use on many common lawn grass types like bermudagrass, bluegrass, fescues, zoysia grass and more. Check the bottle to make sure it is safe for your lawn grass.


Ortho Weed-B-Gon is a suitable chemical herbicide for over 250 different weed species, mostly broadleaf weeds. At the same time, it is safe for many of the popular grass species used on lawns.

With any herbicide, correct application is very important to achieve the best results and avoid killing lawn grass, instead. Always carefully follow the instructions for safe dosages and application.

If applied correctly, Ortho Weed-B-Gon starts taking effect after just 10 hours and kills off all weeds within 1 – 2 weeks. After 24 – 78 hours it is safe to step on lawn again, depending on how long it takes to evaporate.

Simon Barker

After majoring in Agriculture at Ohio State University, Simon’s built up extensive experience over his 10+ years in the industry. He specializes in lawn care and has helped hundreds of his clients get as close to the perfect lawn as possible.

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