How Soon After Mowing Weed And Seed

Do not mow for at least 5 days before spraying weeds. Then, wait 2 days after spraying before you mow your yard. Weed killers work best when weeds have plenty Do You Cut the Lawn and Weeds First Before Applying Weed & Feed?. Applying an herbicide and fertilizer comdination — referred to as "weed and feed" by most retail outlets — can be an effective and simple way to build strong turf and a healthy-looking yard. Each weed and feed product can have different … You might be wondering whether you should mow before or after treating your lawn. Here is everything you need to know about mowing timing around lawn treatments

Should You Spray for Weeds Before or After Mowing?

Do not mow for at least 5 days before spraying weeds. Then, wait 2 days after spraying before you mow your yard. Weed killers work best when weeds have plenty of leaves. This is because systemic herbicides are absorbed through the leaves. Then, they attack and kill the entire weed down to the root. If you mow before spraying for leaves, you get rid of leaf material and make your weed killer less effective. Spray, wait 2 days for the weed killer to be absorbed, then mow.

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How Many Days Should You Avoid Mowing Before Spraying Weeds?

If you’ve just mowed your lawn, wait 5 days before you use a weed killer spray. This will give time for weeds to grow new leaves. The weed killer will then infiltrate the plant through the leaves and get to work killing it.

  • Wait minimum 5 days after mowing your yard before you spray for weeds.
  • Weed killers need to be absorbed through the leaves and recently mowed weeds don’t have many leaves.
  • A weed that has just been mowed is far more likely to survive being sprayed with herbicide.

It may seem strange to spray weeds when they’re at their strongest, but the best weed killers must be absorbed through the leaves. So, the more leaves the weed has the better the herbicide will work. A weed that has just been mowed or weed-whacked won’t have many leaves, so the weed killer may not kill it.

How Long Should You Wait to Mow After Spraying Weeds?

Once you’ve sprayed the weeds in your yard, wait at least 2 days before mowing. As a rule of thumb, most herbicides need a couple of days to enter the plant through the leaves, work their way down the stem, and begin attacking the roots of the plant.

  • Allow 2 days after herbicide lawn treatments before you mow.
  • Herbicides need 24–48 hours to enter through the leaf surface and begin to kill the weed.
  • Mowing too soon may make your weed killer ineffective and allow the weed to survive.

Although most weed killers are rainfast (waterproof) after a few hours, it takes time for the herbicide to be transported through the leaves. By waiting a few days after application before you mow, you maximize the chances that the weed killer will get the job done.

Should You Mow Before Applying Pre-Emergent Herbicide?

Unlike post-emergent herbicide sprays that kill existing weeds, pre-emergent herbicide can be spread right after you mow. The reason for this difference is that pre-emergent herbicide does not need leaf contact. It enters the soil and kills weed seeds at the time of seed germination.

  • You can mow right before spreading pre-emergent weed killers.
  • Water your pre-emergent into the soil before mowing.
  • Mowing if your pre-emergent hasn’t been watered in can throw granular weed killers out of your yard, rendering them useless.
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However, if you’ve spread a pre-emergent herbicide, wait 3–7 days before you mow. During this time, make sure to water pre-emergent into the soil. Otherwise, mowing could throw the pre-emergent off your yard, ruining the application and forcing you to redo the job.

Should You Mow Before Applying 2,4-D Weed Killer?

If you’re planning on spraying a 2,4-D-based weed killer, do not mow the lawn for at least 5 days before application. 2,4-D is a post-emergent weed killer that must make contact with the leaf blade of the weed in order to work. You want unmowed, leafy weeds in your lawn when you spray 2,4-D.

Should You Spray Roundup Before or After Mowing?

As with other post-emergent herbicides, do not mow your lawn for at least 5 days before you spray Roundup. Not only does Roundup enter through the leaves, but it also needs plenty of time to infiltrate the plant after you spray. Wait 2 days after spraying Roundup or any other liquid herbicide before you mow.

Should You Mow Weeds Before Spraying Weed Killer?

When spraying your lawn for weeds, it’s important to follow these quick rules:

  • Post-Emergent Herbicide: If the weed spray is meant to kill existing weeds, don’t mow your lawn for at least 5 days before spraying. Then, wait 2 days after spraying before you mow.
  • Pre-Emergent Herbicide: If the herbicide is meant to stop weed seeds from sprouting, you can apply it right after mowing. However, wait until the herbicide has been watered into the soil before mowing again.

These two simple rules will help promote a healthy lawn, kill weeds, and prevent you from performing repeat weed killer applications.

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

Applying an herbicide and fertilizer combination — referred to as “weed and feed” by most retail outlets — can be an effective and simple way to build strong turf and a healthy-looking yard. Each weed and feed product can have different instructions, and it is always important to follow the directions on the label. Off-label uses, such as increasing the concentration or application rate from the instructions on the packaging, can not only harm your yard but may also be illegal.


It is recommended that you mow a few days before applying weed and feed and that you wait a few days after applying to mow again. This ensures that the herbicide — the “weed” part of weed and feed — has time to be absorbed through the leaves of the weeds and can begin to work. Mowing height can help to battle weeds, but a careful balance must be maintained between keeping the weeds from going to seed and cutting the grass too short. When you use a mower deck height that is too high, you may allow weeds to mature and make seeds. Conversely, if you set the mowing height too low, you will damage the turf and weaken it, leaving vulnerable areas for more weeds to infiltrate the yard. Use a mowing height recommended by your local extension agent for the kind of turf you have.

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If you have a severe weed infestation and you are seeing seed heads popping up in your yard, consider bagging your clippings to reduce the spread of seeds around the yard before you treat with a weed and feed. After treatment, leave the clippings on the grass the next time you mow the lawn. They will help to mulch the turf, and the leftover weed and feed granules that have not been broken down and absorbed will be redistributed around the mowing area. The same applies to clippings treated with a liquid; the plant material that still has chemical left on or in it will break down and rerelease those chemicals back into the soil.

When to Weed and Feed

Weed and feed applications to an entire yard are only necessary if there are weeds in your entire yard. If the weeds are only present in specific areas, such as around gutters or under trees, use a fertilizer that does not have a herbicide and treat the problem weed areas separately with an herbicide for that specific weed. For help in identifying types of weeds, contact your county extension agent.

General Turf Help

Other lawn problems, such as insect damage, over- or underwatering, and animal damage can also contribute to weakening your lawn and opening it up to weed infestation. Look for large areas of discoloration, dead or dying grass, or areas that are thin. One of these could possibly be a fungus or insect signal. Use your local extension service website to help identify any lawn problems you have, and then treat those issues specifically. You may find that by simply watering less, you can slow a weed or fungus problem in your lawn.

A healthy lawn is a dense lawn, and it is difficult for weeds to grow in a dense lawn.

Should you Mow Your Lawn Before or After a Lawn Treatment?

A lush, green lawn is what you’re after in spring and summer. Who doesn’t want to sink their toes into velvety, thick, carpet-like grass? Can’t you feel your stress melt away just thinking about it?
Getting the healthy, thriving lawn that you want takes some work. To avoid unsightly brown spots and the effects of heavy foot and pet traffic, you need to care for your beloved grass. If you neglect it, there won’t be much to sink your toes into.

Regular, proper fertilization helps maintain the soil’s nutrients at a consistent level to keep your grass happy.

But you might be wondering whether you should mow before or after treating your lawn. After all, you don’t want to waste it.

Don’t worry. We’ve got your back. Here is everything you need to know about mowing timing around lawn treatments.

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What You Should Know About Mowing Before or After Treating Your Lawn

During the growing season, you should be mowing your lawn about once each week.

As mowing frequency increases as the weather warms up, timing it around fertilization and weed control treatments can feel tricky.

These mowing tips and tricks should clear up any confusion.

Best Times to Mow Your Lawn

Fertilization, granular specifically, is rarely impacted by mowing. But weed control treatments can be impaired.

You usually don’t want to mow your lawn within 24 hours before any such treatment.

This is because if you mow right before an herbicide treatment, there isn’t much leaf area left to absorb the weed control. If a broadleaf weed control doesn’t come in contact with enough of the plant’s foliage, it won’t be effective.
How long do you wait to cut the grass after a lawn treatment? You should wait to mow for 24 to 48 hours post treatment . This is because it takes at least 24 hours for broadleaf weed control to translocate throughout the vascular system of the plant. If you cut the grass too soon, you’re not letting the herbicide get into the plant.

The Grass Clipping Benefit

When you mow after a lawn treatment, it’s always better to leave the clipped grass blades on the lawn.

These clippings act like barriers to help hold in the newly applied nutrients. Bonus: They also provide your lawn with organic nutrients to complement the fertilizer.

Remember the Mowing Basics

Whether you’re mowing your lawn before or after a lawn treatment, remembering the basics is essential to ensure your lawn thrives and you don’t waste your time.

First, make sure your mower is properly prepped. This means sharpening your mower blades, filling the tires with air, changing the oil, and ensuring it’s working correctly before the growing season is in full swing.

Then, when you mow, remember that your grass blades should be 3 to 4 inches tall after you mow. You never want to remove more than one-third of the lawn at any one time so as not to stress it out.

To Mow or Not To Mow: Your Questions Are Answered!

Mowing is an important part of a healthy lawn. And doing it right can keep your lawn happy and maximize the effectiveness of lawn treatments.
Regular mowing not only improves its appearance, but also helps it grow thicker, choking out weeds.

If mowing before or after treating your lawn is still confusing to you, never fear. Here at Natural Green, we’re happy to answer your questions about proper timing and mowing techniques to help you take better care of your lawn. It’s what we do here in Central and Southern Maryland, and we’re always happy to share our knowledge about what your grass likes best.

We’d love to be a part of helping you achieve the lawn of your dreams in Central or Southern Maryland. Get started today with a free quote. Together, we’ll prepare a customized plan so you can have the best lawn on the block.