How Soon Can You Mow After Spraying Weed Killer

Invasive weeds aim to destroy your lawn and feed off it, but once you spot them and plan your counter moves, you’re contradicted between mowing for a better health for your lawn, or applying weed killer to get rid of the intruder.

That’s why you’re wondering How Soon Can You Mow After Spraying Weed Killer.

If you’ve asked around in your neighborhood or on your family’s group chat, one would tell you that you should mow immediately after applying the weed killer.

Another would ask you to mow before applying.

In this Lawn Advisors guide, we’ll give you the answers you seek, built on years of expertise our team has accumulated over the past 20+ years.

Read through to find the answers.

Should You Put Weed Killer Down Before or After Mowing?

You shouldn’t mow the grass before applying weed killer, you should even leave your lawn uncut for 5 days before applying weed killer.

Moreover, you should stay off your lawn for a full day after application, without stepping on it or applying water too soon as well.

Should You Put Weed Killer Down Before or After Mowing?

How Soon Can You Mow After Spraying Weed Killer

You can mow our lawn with weeds colonizing in it after 2 days of spraying the weed killer.

Waiting 48 hours (2 days) allows the herbicides in the weed killer to take effect on the weed and start reducing its growth gradually.

Once you wait the 2 days period then start mowing the lawn, you’ll be able to remove the damaged weeds, preventing them from spreading their seed or even regrowing once more.

Mowing also helps maintain your lawn grass’ health and proper growth, reducing the area or space available for weeds to rebuild their colonies once again.

Additional experts tip: it’s always better to leave the clipped grass blades on your lawn after mowing following up to the lawn treatment.

Those clippings will act as a barrier that’ll help the grass get hold of the newly applied nutrients.

Additionally, having those clippings will also provide your lawn with organic nutrients to complement the fertilizer.

Is It Better to Use Weed Killer When the Ground is Wet or Dry?

Generally speaking, residual herbicides in weed killers require some soil moisture to work properly, but the soil shouldn’t be soaked with water, as it’ll nullify the weed killer’s effectiveness.

Therefore, the herbicides will be fully activated when the soil is moistened to a low level, allowing the weed seedlings to absorb that little water that contains the herbicides, leading to the weed’s death soon after it takes the herbicides in the absorbed water.

How Often Should You Put On Weed Killer In Your Yard?

Since different weed types grow at different times throughout the year, then you should prepare for each season separately, by applying weed killers multiple times a year.

There’s a misconception that applying weed killer is an intervention that should be done once a year or can even become a one-time thing, but the reality is every lawn requires 5-6 treatment sessions per year, depending on how well it is maintained throughout the same period.

Can I Spray Weed And Feed After Mowing?

Similar to how we explained what you should do when you’re wondering How Soon Can You Mow After Spraying Weed Killer, you should wait 2 days after spraying weed and feed, and leave your lawn uncut for 5 days before applying it.

This gives your lawn the best chance to benefit from weed and feed, instead of rushing in on the situation.

Can I Spray Weed And Feed After Mowing?

How Long After Fertilizing Can I Spray For Weeds

In a related matter, you should wait 10-15 days after applying the fertilizer before you spray the weed killer. 

The waiting time will enable the lawn to become more powerful and healthy, and during this period they shouldn’t take in the herbicides.

After the 10-15 days, applying the herbicides will be effective against the weeds only, while the lawn is strong and healthy due to the effect of fertilizing properly.

Will Fertilizer Make Weeds Grow Faster?

Applying fertilizers won’t make weeds grow faster, on the contrary, it’ll make soil less appealing to the weeds that require a level of nitrogen to grow and feed.

Fertilizers will disrupt that level of nitrogen, and will force weeds to either live in an unpleasant environment, or even kill the weeds and get rid of them.


Now that you have your answer to How Soon Can You Mow After Spraying Weed Killer, and knowing you’ll wait 2 days to make sure weed killer has taken effect makes it more reasonable to wait.

Moreover, we provided you with additional information on when to mow before applying weed killer, in addition to much important information connecting weed killers and fertilizers.

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