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HomeExclusiveHow To Apply Weed Killer To Lawn

How To Apply Weed Killer To Lawn

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Use A Dial Sprayer When Weeds Are Out Of Control

How to apply lawn weed killer

If your whole lawn is filled with weeds, a dial sprayer attached to your garden hose is the answer. It’s fast and efficient. It’s just a matter of adding concentrated broadleaf killer to the pot, and setting the dial at the top to the mixture called for on the herbicide containerâfor example, 2-1/2 tablespoons per gallon of water. Then hook up the garden hose and apply an even treatment to the weedy areas. Clear the yard of toys, furniture and anything else that can get contaminated by overspray. And be sure to protect your flowers and bushes with plastic sheeting or cardboard. Remember that broadleaf killers will kill or harm anything with leavesâincluding your flower bed.

How To Spray Lawn Weeds

Spraying weeds can be a highly complicated matter as there are different herbicides to treat different lawn weeds. The herbicides can slightly work or be very different, they can be tolerant or intolerant of different lawn types, and the complications can continue.

However, for most of us, if we know the weed types were dealing with we can usually purchase the appropriate herbicide for our needs and apply it with reasonable certainty when following the instructions on the packaging.

Our aim with this article is to give an overview of some of the considerations that people should be aware of when doing any type of weed spraying on their lawns.

The Best Time To Apply Post

Post-emergent weed killers are most effective when the weeds are actively growing. Selective post-emergent herbicides target certain types of plants, like perennial broad leaf weeds like dandelion and plantain or annual weeds, but don’t harm turf grass. Perennial weeds return every year. The best seasons for applying a post-emergent weed killer to control perennial broad leaf weeds are early fall and spring. Apply the weed killer on a still day when the air temperature is between 60 and 80 degrees Fahrenheit, and no rain is forecast for 48 hours.


Don’t apply a post-emergent weed killer to a drought-stressed lawn or when air temperatures are higher than 90 degrees F, or the herbicide could damage the grass.

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How To Use Different Types Of Weed Killers

Herbicides are weed-killing pesticides. With the help of these products, you can get a perfect lawn, significantly increasing the yield of vegetables and fruits. However, to get the expected result healthy and strong plants without any weeds, you need to understand how the product works and follow a few simple rules.

All weed killers are divided into:

  • Non-selective herbicides
  • Selective herbicides

Typically, non-selective herbicides such as Hurricane Forte and Roundup weed killer are used before cultivating the lawn or flowerbed.

Solid herbicides, mainly based on substances such as glyphosate, destroy virtually all plants. A wide variety of the products of selective action is capable of destroying, for example, chamomile or dandelions.

When spraying a glyphosate-based weed killer, do not let it fall on the leaves of trees, even small concentrations of such a product can kill fruit trees and shrubs.

The use of soil herbicides is good when the weed spreads the seeds into the ground. Such drugs are applied directly to the ground. They adversely affect the weed seeds.

How Long Does Weed Killer Take To Dry

Ortho® WeedClear Lawn Weed Killer Ready

Fast-acting liquid herbicides can take effect within hours after application, but its usually recommended to let the treatment dry a full day or two before watering your lawn next. Granular weed killer usually needs a long period of dryness, ten to fourteen days, to be sure the soil absorbs the herbicide and the roots of the plants.

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Why Should You Use Organic Weed Killers

Organic weed killers are a safer option compared to chemical weed killers that contain toxic ingredients which are harmful to both healthy plants and humans.

They are not as harsh on the nearby plants while killing different types of weeds.

They are also a good option you should consider if you have pets or children at home.

Dogs and cats tend to eat grass, and while eating grass, they can also engulf the harmful weed killers. For this reason, it is best to stay on the safer side by choosing organic weed killers over chemical herbicides.

They also do not have a pungent smell like the chemical weed killers.

It is because they are mostly made up of essential oils, which have a lovely fragrance. So, you will not have to tolerate a bad smell for days while using organic weed killers.

You will also not have to wait for several days to start using your garden again.

Yard And Garden: Timing And Applying Broadleaf Lawn Herbicides

AMES, Iowa The air has a bit of a chill in it in the mornings. Fall is almost here, which means its time to think about preparing lawns with weed control. Fall is an excellent time to apply broadleaf herbicides for perennial broadleaf control, but take care to do it properly and effectively.

Iowa State University Extension and Outreach horticulturists can help answer questions about the right time and methods to apply broadleaf herbicides.

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Rain And Lawn Treatments

If its going to rain the day you go to apply the weed killer, you should avoid putting down herbicides until after the rain passes and the leaves dry off. Some herbicides need up to two weeks of dry weather for best effects, so taking a look at the weather forecast can help you avoid having your weed killer treatments diluted or washed away.

Top Recommended Professional Lawn Care Company: Trugreen

How to Use Ortho® WeedClear Lawn Weed Killer Concentrate for Northern Lawns

The This Old House Reviews Teams top selection for lawn care, TruGreen, offers both pre- and post-emergent weed control to restore your lawn to its former health and make sure it can compete against future weeds. The lawn care company offers five annual plans with varying levels of coverage in every state except for Alaska. If youd like a free quote, call 866-817-2287 or fill out this simple form.

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Homemade Weed Killer Ingredients

The most effective homemade option is a mixture of white vinegar, salt, and liquid dish soap. Each of these ingredients has special properties that combine to kill weeds.

Both the salt and the vinegar contain acetic acid, which serves to dry out and kill the plants. The dish soap, meanwhile, reduces the surface tension in the mixture so that the liquid enters the pores of the leaves rather than remaining harmlessly on the surface.

For a healthy supply of this man-made concoction, mix a gallon of white vinegar, one cup of salt, and one tablespoon of dish soap. Make sure it is properly stirred, then put the mixture in a spray bottle for easy use. You can stash the bottle in your house for repeated use.

It is best to apply the weed killer during the sunniest part of the day, as they sun and heat help dry out and kill the weeds. Spray the weeds from close range, making sure they are entirely soaked. Remember that the solution makes no distinction between weeds and desired plants, so be sure to spray it only on what youll be happy to see killed.

Spring And Fall Are The Best Times

Weed and feed products should be applied no more than twice a year, so one application in the spring, and another in the fall if the first one didnt resolve the issue. Further, each application should be at least two months apart, because not waiting long enough between applications could cause the herbicides to build up to high levels that can kill healthy grass and vegetation.

Considering weed and feed products contain chemicals, there are a few safety precautions you need to take, starting with making sure kids and pets stay off the lawn until it dries completely. It is best to wait until the next heavy rain or when the granules have completely dissolved before allowing foot traffic on your lawn.

If youre applying pre-emergent weed and feed, then the best application time is prior to weed seed germination. But if youre trying to control summer weeds, early spring is the best time to apply weed and feed.

However, if youre trying to kill crabgrass, you should apply weed and feed in mid-April. As mentioned earlier, post emergent weed killers will only kill weeds that are actively growing at the time of application.

Given that fertilizer applications arent recommended in the summer such as in temperatures above 90-degrees, post-emergent herbicides to kill tough broadleaf weeds such as dandelions and clover should be applied from late spring onwards.

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Will Mulch Stop Weeds

Mulch won’t stop weeds completely. Applied deep enough, it will prevent many weed seeds already in the soil from germinating and growing. But it won’t stop weeds that have already rooted. Tough weeds like dandelions will push right through if you don’t dig them out first. And more weed seeds will blow in and take root in the mulch . All mulch-covered gardens require maintenance, though less than if you don’t use mulch.

Late Spring Is A Good Time To Apply Weed Killer Because Weeds Are Still Young At That Point And Are Less Able To Fight The Effects Of The Herbicide

Ortho Weed B Gon Weed Killer For Lawns Ready

Best time to spray weed killer on lawn. Ortho weedclear lawn weed killer . Weed and feed products, unlike weed killer or manual weed removal , offer twofold benefits they kill weeds and fertilize the lawn in a single application. As the weather starts to warm up, it becomes a very prolific grower and often times will not be affected by most weed killers.

Plant growth speeds up and slows down over the course of a day, depending on light level, temperature and the local climate. By doing this, you can minimize the problem come the following spring. Applying systemic herbicides at the peak plant growth times during the day increases the herbicides’ effectiveness.

Some weeds, though, grow best in warmer or cooler conditions. Apply the weed executioner on a still day when the air temperature is between 60 and 80 degrees fahrenheit, and no rain is forecast for 48 hours. Spring is the best season to apply weed killer, whereas summer is less ideal.

A lawn owner should have to choose the best weather and the best application timing to get the best result, so. The row for each weed listed has a colored bar. Spray the weed killer in early spring, then another application eight weeks later.

The best time of the day to apply weed killer is late morning. Weeds always interrupt the growth of plants. The chart is arranged with a list of common weeds in rows on the left, and months of the year in columns on the top of the chart.

Best Time To Plant Grass in 2020 Growing grass, Zoysia

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Best Value Weed Killer For Lawns

Ortho Weed B Gon concentrate is our top contender for its affordability and effectiveness at killing tough lawn weeds. It contains triclopyr, an active ingredient that works wonders on controlling Creeping Charlie, clover, plantain and more.

Use Weed B Gon with a tank sprayer or the Ortho Dial N Spray. When applied to actively growing weeds, it becomes rainproof after six hours. One 16-oz. container treats up to 3,200 square feet of lawn.

Facts About Weed Killers & Chemicals

Satisfaction with any product comes when you have reasonable expectations about the results.

It may seem like the best product SHOULD kill everything you want it to kill, in one application, with no negative results, and very little bother.

That is not realistic. Here is what you need to know:


Lawn weeds may die after one application of weed killer. Additional spraying may be required for more mature weeds, for perennial weeds with stronger root systems, or for some stubborn types, especially those with waxy or hairy covering.

Definitions: Mature Weeds = the massive ones in your lawn because you waited too long Perennial Weeds = hardy weeds, like dandelions, that keep returning. By their nature, they survive season to season, unless you knock them out.

Stubborn Weeds = do not readily absorb herbicides, or drink it down and laugh in the face of danger probably genetically modified by mad scientists, hence the ugliness of waxy or hairy coverings


Weed killer does NOT work better with a stronger concentration. It is better to spray again, rather than go with a heavier dose which can have negative consequences.

Additional reasons to avoid this will follow below, but this is the #1 error that gardeners make when they get the notion to kill those darn weeds.


Weed killers take time, more or less. Some work quickly, within hours you may see dieback. Others work slowly and may take many days before you notice any result.

Read Also: How To Rid Lawn Of Clover

How To Use Weed Killers Without Harming Plants

Killing weeds is easy with contact sprays. Wherever the weed killer lands, your weeding job is nearly done. But weed killer does not always distinguish between valuable landscape plants, favorite flowers and the weeds you want to remove. To ensure you do not accidentally harm desirable plants with weed killer, try some of these no-miss tips.

Related Products

Apply anytime – spring through fall at temperatures between 50 degrees F and 90 degrees F.

On established lawns without harming lawn grasses.

Do not use on Carpetgrass, improved varieties of St. Augustinegrass, such as floratam, dichondra or desirable clovers.

Spray when weeds are small and actively growing when temperatures are above 60 degrees and when it is sunny.

On patios, sidewalks & driveway cracks, gravel areas, paths and along fence lines. Around established ornamentals, ornamental beds, tree rings, mulched areas.

Do NOT use around non-established plants, shrubs, or trees

Spray when weeds are small and actively growing when temperatures are below 90 degrees.

Do not apply to Bermudagrass lawns when daytime temperatures exceed 85 degrees F.

On lawns without harming lawn grasses – Bermudagrass, Buffalograss, Kentucky bluegrass, ryegrass, fescue, zoysia, bentgrass.

Do not use on Bahiagrass, Carpetgrass, Centipedegrass, St. Augustine including Floratam or Dichondra.

Weed Killer Mishaps

Protect Other Plants

Target the Weed

When Is The Best Time To Use Weed Killers

How to Use Ortho® WeedClear Lawn Weed Killer Ready-To-Spray

It is best to use a weed killer in spring, a few weeks before cultivating the major plants and trees in your garden. The second treatment is done in 2-3 weeks to fully destroy weeds. In this case, the weeds left deep in the soil will be destroyed. The main thing to remember during the weed control on your lawn is to prevent the spread of seeds and destroy young plants before flowering. The weed seeds in the soil must deplete, and their number will decrease drastically.

In this case, you will be able to do local treatments or manual removal of weeds. In addition, the weeds that have reached a height of 6 inches or more are less vulnerable to herbicides. In this case, it is necessary to mow the overgrown weeds, give them to grow to 2.5 3 inches, and only then to apply a grass killer.

Factors to take into account before using a weed killer:

  • Accuracy of dosing
  • Processing of actively growing plants
  • The season with the best temperature
  • Feeding weeds with nitrogen increases the effect
  • Accurate weed diagnosis must be done before applying a selective grass killer

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If You Choose To Use An Herbicide Keep These Points In Mind

  • The pesticide label is the law. Read and follow the label directions. The information provided is for the safest and most effective use of the product.
  • Select ready-ready-to-use products to spot treat weeds eliminating the need for mixing and using a sprayer. If you choose a concentrate product dedicate a sprayer for herbicide use only.
  • Keep herbicides in their original container and purchase the amount needed for only one season.
  • Herbicides work best on young weeds and when the weeds are actively growing. Do not treat drought-stressed lawns.
  • Late summer into fall is a good time to treat difficult weeds like creeping Charlie. Perennial plants move the foods they make, along with what is sprayed onto their leaves, down to their root system as they prepare to go dormant for the winter.

When To Apply The Weed Killer

For the mixture to be truly effective, it is best to wait for a bright, clear afternoon. On a sunny day, the effect of the weed killer should be evident in a few hours. Youll likely notice the leaves of the weeds turning brown. The leaves should get darker and darker before eventually withering away.

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Applying Weed Killer To A New Lawn

New lawns are more sensitive to herbicides than established lawns. Don’t apply pre-emergent weed killer to a newly seeded lawn. When the grass has an established root system, you can safely apply a pre-emergent herbicide product that contains dinitroaniline. Additionally, in spring, you can apply a product that contains pendimethalin to a lawn that was seeded in fall, after the lawn has been mowed four times.

When applying a post-emergent herbicide to a new lawn, again, wait until the lawn has been mowed four times. If the lawn is newly sprigged, wait until the sprigs are rooted and growing. Apply the weed killer at half the rate recommended on the label, and reapply the product seven to 10 days later to treat weeds that may have survived the first application.

How Long To Stay Off Lawn After Weed And Feed

Ortho WeedClear Lawn Weed Killer Ready

You should be good to use your lawn again after 24-72 hours. This give the fertilizer time to work its way into the soil. See the paragraphs below for when to water after application.

As always, we would recommend that you read the manufacturers directions included on the packaging. .

You should also not carry out aerating after weed & feed application, as it can possibly damage any new emerging grass seedlings.

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