How Soon Can I Weed And Feed After Seeding

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 Weed and feed products have both fertilizers and herbicides to target broadleaf weeds. These products are used to kill weeds and green up the grass. Weed and feed can help …

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.
  • No Mixing, No Glyphosate and No Hormone Disrupting Chemicals

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.

No products found.

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.

See also  Weeds With Black Seed Pods

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.

No products found.

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.

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.

Mowing after weed and feed, what should you do?

Weed and feed products have both fertilizers and herbicides to target broadleaf weeds. These products are used to kill weeds and green up the grass. Weed and feed can help to build a strong turf and healthy lawn. To ensure that you are using the correct product for your grass species, always check the label on the product. Increasing the concentration or application rate can harm your lawn. To achieve the best results from weed and feed, mow your lawn to a recommended height at specified intervals before or after the application.

Mowing after weed and feed, what should you do:

In general, mowing just before or soon after weed and feed application is not beneficial at all. The weed and feed granules are collected or get dispersed unevenly before they get a chance to work. The best practice is to mow the lawn to a correct height a couple of days before weed and feed application or a couple of days after the application in case you are using post-emergent weed and feed.

This article will guide you by mowing your lawn after applying weed and feed to achieve the best results. It will discuss the effects of mowing too short or leaving the grass to grow long after weed and feed. You’ll also find information about the best time to apply weed and feed to your lawn and precautions that must be taken to avoid any mess.

Mowing after weed and feed application

Mowing the lawn just before weed and feed application may damage and burn the grass. Mowing causes stress to the grass and creates wounds on the grass blades. The chemicals in weed and feed products may affect the wounded blades of the grass and burn them. Herbicides in the weed and feed product work better when the grass is not compacted from mowing.

See also  Free Weed Seeds Giveaway

It is also recommended to wait a few days after applying weed and feed to mow your lawn again. Mowing the lawn instantly after weed and feed application does no good to your lawn. The granules of weed and feed product get collected in the mower bag and don’t have any time to work before the mower picks them up.

If you mow the lawn without bagging the clippings, even then, the weed and feed product’s granules are irregularly dispersed by the mower, creating some areas full of weed and feed and others with no granules of the product.

Mowing the lawn after weed and feed application can be more effective if your lawn already has weeds growing in it and you are using a weed and feed product with a post-emergent herbicide. Mowing weeds before weed and feed application chops off the weeds and reduces the surface area of the weed leaves that would otherwise take up the chemical and hinder weeds’ growth. As such, this doesn’t allow the product to work effectively.

Mowing height always helps to battle against the weeds. A careful balance must be maintained between keeping the grass long enough to help the weeds from going to seeds and cutting the grass too short.

Mowing at higher heights may allow the weeds to mature and make seeds. On the other hand, mowing too short weakens the turf and causes damage to your lawn’s health. This makes your lawn more vulnerable to weeds. Mowing the grass to a recommended height helps you to maintain the right balance.

“Weed and feed” and bagging while mowing

If your lawn faces severe weed infestation and the weed has gone to seed, then you must consider bagging the grass clipping before you apply weed and feed. This helps to stop the seeds from spreading all over the lawn and affecting the healthy areas.

Once the weed and feed treatment is done, you can leave the clipping on the grass for the next few times you mow the grass. These clipping will help to mulch the turf. Mowing a few days after weed and feed application allows the leftover product granules to break down and redistribute around the mowing area.

The same applies to bagging the clippings if you use liquid weed and feed products. The clippings that have chemicals left on them will break down and release the chemicals back into the soil.

Mowing too short after weed and feed

Mowing too short after weed and feed makes your lawn more vulnerable to weather stress, weeds, and diseases. Cutting the grass too short also inhibits root growth. When grass is mowed too short, the leaves’ surface area is reduced, which is where the grass makes food. Therefore, it relies on roots to grow, which weakens the roots, and they are less able to endure rain and drought.

Shallow roots require more water and make it difficult for the grass to maintain moisture. A grass mowed too low has less leaf available for photosynthesis and, as a result, this damages the grass. Short grass exposes the turf to direct heat, which causes it to dry quickly – especially in summer.

Therefore, extra care is needed for short grass by watering it frequently to protect it from drought. Moreover, grass cut too short struggles to fight the intruders and succumbs to disease, weeds, and pests.

Leaving the grass long after weed and feed

Growing grass too long after weed and feed are also not advisable, as it makes it difficult for the grass to hold itself up, and it drops on the surrounding grass, suffocating it. Long grass also traps moisture in the lower areas, making the lawn prone to fungus and other diseases.

The grass may grow unevenly, and your lawn may look rough. Moreover, there is also a high chance that the grass may turn yellow or brown. Not mowing for an extended time after weed and feed may cause the grass to go to seed, whereby its blades look more like weeds than grass.

Long grass may overwhelm your mower and dull your mower’s blades when you try to mow it after a long time. Clippings left behind after mowing the longer grass are also longer and difficult to manage. Longer grass clippings often sit on the top of the lawn and are difficult to remove.

Do You Cut the Lawn and Weed First Before Applying Weed & Feed?

I recommend waiting at least 2 to 3 days after mowing before applying weed & feed. And after you applied the weed & feed you should wait again at least 2 to 3 days before mowing your lawn. This helps the grass to absorb the herbicide. If not you will apply it partly to cut leaves, or you cut the leaves before it has been absorbed.

Always read the manufacturer’s recommendations for your particular weed & feed product.

When to weed and feed

Weed and feed products that contain pre-emergent herbicides must be applied in early spring before weeds appear. These products are applied over a dry lawn. A pre-emergent won’t affect the weeds once the weeds have already appeared on the lawn.

The lawns that are already infested with weeds must be treated with weed and feed product that contains post-emergent herbicides. These products must be applied over a wet lawn so that the product’s granules stick to the weed’s leaves. They must be applied from late spring onward.

See also  Why Does My Weed Have So Many Seeds

Weed and feed products contain both herbicides and fertilizer. They must be applied if your lawn contains weeds and also need fertilizers. Using weed and feed over an entire lawn is only necessary if there are weeds all over.

If weeds are only present in a specific area of your lawn, then you must apply fertilizer and herbicides separately. Using herbicides in areas where there are no weeds is just a waste of money, as that patch doesn’t require any herbicide treatment. Therefore, you must always consider applying fertilizer and herbicide separately if you don’t have weeds all over.

Weed and feed products for bluegrasses, fescues, and ryegrasses should be applied in spring or fall. During this season, the weeds are actively growing in these grasses, and hence it is the best time to hinder their growth.

For warm-season grasses like bermudagrass, zoysia, and St. Augustine, the weed and feed should also be applied before the targeted weed seeds germinate.

Before applying weed and feed, the forecast should be clear of rain for at least 24 hours. To spread weed and feed evenly over the lawn, use a spreader. Sprinkle the grass before weed and feed application to dampen it.

Bagging the clippings before treatment

If your lawn suffers from a lot of weed, I recommend bagging the clippings before you apply the weed & feed. This will reduce the seeds spread around other parts of the grass.

After you have used the weed & treat, this is not needed. I even recommend not removing them after the first mow after applying the weed & feed. In that case, the clippings will contain some weed & feed this will break down and reach the roots of the grass.

Weed and feed application

When you want to fertilize your turf and control the weeds with the same application, weed, and feed is an option to consider. The best way to choose the correct weed and feed product for your lawn is to observe your lawn care and decide whether you are trying to prevent weeds from growing or trying to get rid of the ones that are already there.

If you don’t have weeds on your lawn and try to prevent any future growth, you must use pre-emergent weed and feed products. When you apply this product to your lawn, you create a barrier underneath the soil. When the weed seeds try to emerge on your lawn, they face this chemical barrier and die out before they can sprout.

A post-emergent weed and feed product is used when you have already grown weeds on your lawn, and you are trying to remove them. This product needs to stick to the weed leaves to hinder growth and prevent them from further growth. Make sure that the chemical doesn’t get washed off into the ground.

The two important things to remember about weed and feed application are:

  • Watering lightly prior: Water the lawn lightly before applying the product so that the leaves are wet and the granules stick to the leaves.
  • No watering after: Avoid watering soon after application to give the product time to get absorbed and taken down to the roots.

Warnings and Precautions

Avoid mowing the lawn for at least one week after weed and feed application. Otherwise, the granules may get collected in the lawnmower bag.

Keep pets and children out of the area where weed and feed are applied. The product should stay on the lawn for at least two days before watering. You can mow the lawn after watering once the lawn is dry.

Avoid using weed and feed products on new lawns. If you have planted grass seeds in your yard, you must wait for at least 16 months after their plantation. If you have planted sods, you should wait for at least 3 months before applying weed and feed.

Reseeding the lawn soon after weed and feed application is not advisable. The pre-emergent herbicides in the product will hinder the growth of grass and prevent it from germinating. You should wait for three to four weeks after applying weed and feed before you reseed the bare spots in your lawn.

Watering the lawn after weed and feed application washes out the granules before they have a chance to work. Therefore, avoid watering the lawn for at least two days after application.

After application, pour the water on the grass and not down the drain when rinsing spreaders and other equipment types to prevent the contamination of waterways.

Weed and feed products work on broadleaf weeds only. If you have grass-like weeds on your lawn, then use crabgrass products instead. Avoid weed and feed application during the summer heat. Otherwise, you will burn your grass. Use a regular fertilizer to meet the needs of the grass in your lawn during summers.

Final Word

Applying a combination of fertilizer and herbicide can be an effective way of boosting your lawn’s health and getting rid of the weeds in your lawn. The most important thing while using weed and feed products is to follow the directions on the label. This will help you to control the concentration and application rate according to the type of grass you grow in your yard. Mowing the lawn to the correct height can help to achieve the best results from weed and feed application. Mowing at least two days before or after the application is the most suitable practice. After successful weed and feed application, frequent mowing can help to achieve the best results.