Using A Pressure Washer To Spray Herbicide (2023)

The competition has begun, spring has arrived, and weeds are swiftly invading your pavers. It is tempting to pull out your pressure washer, load it with herbicides, and go nuts on those annoying plants spoiling your patio.

Using a pressure washer to spray herbicide on your patio instead of the back-breaking hand-picking method is an easy, quick, and fun way to get the job done.

However, this fun method works by blasting the surface and, if not used properly, will cost you more than the back-breaking hand-picking method.

Here’s everything you need to know about using a power washer to keep weeds at bay.


  • Can you Pressure Wash with Herbicide?
  • What kind of herbicide can you put in your pressure washer?
  • Using a Pressure Washer to Spray Herbicide
  • FAQs about Using a Pressure Washer to Spray Herbicides
  • How much PSI does a garden sprayer have?
  • Do I need a garden hose for a pressure washer?
  • Does herbicide pressure washing destroy sealant?
  • Author

Can you Pressure Wash with Herbicide?

We already know that a pressure washer can perform admirably on its own. It can quickly remove dirt and weeds from between your pavers.

However, you should consider whether using a pressure washer with a herbicide is good. It appears to be an excellent concept because the pressure washer removes the weeds and the herbicides prevent them from regrowing.

Combining a pressure washer and a herbicide is an excellent approach to quickly completing a monotonous chore. However, the answer to this question is dependent on several things.

The most critical consideration is what surface you intend to blast with that high-pressure washer.

Of course, you’re not going to use the pressure washer in your garden. Even yet, using a pressure washer to clear weeds from your asphalt is not suggested, especially if your washer has a high amount of pressure.


Using the pressure washer machine to flush the weeds out of the spaces between your pavers will begin to damage the slabs, causing them to become loose and lift over time.

Set your pressure washer to the proper setting to minimize additional repair costs.

Your surroundings will be another element to consider because you will be spraying a herbicide with a high PSI pressure washer. Your fluids will almost certainly end up on other healthy plants on your property.

Furthermore, using high PSI pressure can aerosolize a lot of the liquid herbicide, making it extremely dangerous to spray herbicide with a pressure washer, especially if your family is present.

Using A Pressure Washer To Spray Herbicide (1)

Best Way to Remove Weeds from Large Area

What kind of herbicide can you put in your pressure washer?

You can see the broad picture now, but if all you want to do is start blasting those nasty weeds with your herbicide-laden pressure washer, I won’t let you down. When handled correctly, the combination of a pressure washer and herbicides is safe.

The type of herbicide you use and the pressure of your power washer will have a significant impact on your safety. You’re dying to find out more.

It is not good to fill your pressure washer tank with Roundup. If you prefer to use your pressure washer, you can use an organic herbicide instead of the harmful synthetic herbicide.

The organic weedkiller concoction of vinegar and dish soap is safe and environmentally friendly, but the acidity of the vinegar will create corrosive effects on the steel parts of your pressure washer.

As a result, using more than 5% vinegar in your pressure washer is not recommended.

It is safe, but you will have to do extra duties after finishing; you will have to thoroughly rinse your pressure washer with tap water. Even if you are using vinegar, wear protective gear because it can cause minor irritations.

(Video) Killing Driveway Weeds FAST with a Pressure Washer - Saving Block Paving from LOTS of WEEDs

Also read: Recommended protective clothing for spraying herbicides

Using a Pressure Washer to Spray Herbicide

This is now a major matter. The typical hand spray we use in our gardens is no more than 400 pounds per square inch of pressure. Therefore using a pressure washer means you’re putting around 3000 PSI in a tank loaded with herbicide.

Once the tall weeds have been eliminated, you can use a power washer to remove the short weeds. Set your pressure washer appropriately; a 2000 psi nozzle is ideal.

The nozzle should provide a focused spray because a broader spray will likely splash the herbicide into the surrounding area, harming your beautiful flowers.

Also read: What is the most effective dandelion killer that won’t harm grass?

Keep the pressure washer moving after you start spraying; lingering in one location for too long may cause a lot of damage. You should keep your wand at least a foot away from the surface. This will significantly reduce the likelihood of damage to your pavers.

Wait for it to dry after the pressure washer to ensure that the herbicide is absorbed adequately before applying a paving sealer.

The paving sealer will keep the joint sand from deteriorating further. Using a pressure washer to eliminate weeds regularly will cause the shifting and sinking of your paver.

Also read: Weed removal tool for block paving

Using A Pressure Washer To Spray Herbicide (2)

FAQs about Using a Pressure Washer to Spray Herbicides

How much PSI does a garden sprayer have?

Garden sprayers vary in the amount of PSI they produce; they range from 40 to 150 PSI. this allows the herbicide to properly soak in the weeds.

Also read: Herbicide that kills everything but Bermuda lawn

Do I need a garden hose for a pressure washer?

A pressure washer is best used with a pressure washer hose. Due to the high amount of pressure, a garden hose may not be able to handle it.

Does herbicide pressure washing destroy sealant?

Due to its high pressure, it can easily remove old concrete sealers. But a combination of a pressure washer with herbicide may cause the damage even quicker since some herbicides can react with the sealant.
Also read: Can I spray weeds after mowing?

(Video) Blasting weeds off a paver patio - Pressure washing ASMR!

Weeds have no boundaries and limits; you won’t miss a weed anywhere conducive. They don’t value the time and effort you’ve put into making your property appear attractive. So, it is reasonable if you are eager to go to any length to keep the weeds at bay.

Using a pressure washer to spray herbicide, on the other hand, is an extreme practice that must be approached with caution.

(Video) Pressure washer vs driveway weeds - real time

Keep in mind that while high pressure may be effective in blasting away weeds, it may atomize the herbicide, causing it to disperse in the wind. The herbicide will not effectively soak the weeds.

Consider utilizing the appropriate sprayers; otherwise, go berserk on those pesky weeds damaging your pavers if you are comfortable using a pressure washer. Have fun!

  • Using A Pressure Washer To Spray Herbicide (3)


    Hi, I’m Ricky.I’ve been involved in lawn care and landscaping from when I was 15. To be honest, I didn’t like the idea of pushing mowers, collecting grass clippings, and maintaining flowerbeds at the time.But having seem the passion my parents had for gardening and outdoors and the effort they put in maintaining the health and beauty of our landscape, I couldn’t help but not only admire their hard work but also I became a part of it.As someone who loves to spend time with nature’s best, I find myself learning a lot more about gardening and outdoors on a daily basis. Not to mention I love to share the knowledge I’ve gathered over the years with my readers at We Mow Dallas.To be clear, I don’t have a Master’s degree in gardening or anything like that. Everything I’ve learned about gardening, landscaping, and lawn care spring from passion and engagement with my parents. And with a ton of free information out there, plus the ability to run tests and determine what works best for lawn care and landscaping, every day is an opportunity to learn and implement something new.My goal with We Mow Dallas is to teach you exactly how to maintain your lawn and landscape. And since I walk the talk in reality, you shouldn’t hesitate to join me in this wonderful world of landscaping and lawn care.

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(Video) How To Prepare a Perennial Bed for Winter (And MORE!) | Gardening with Creekside


Can I use a pressure washer as a sprayer? ›

You can use a pressure washer to spray off a wooden deck, siding, a car or a concrete surface such as a patio, walkway or driveway.

Can you use pressure washer to remove weeds? ›

Yes! Jet washing is a great way to blast away any dirt, grime, and those annoying hard-to-reach weeds that grow around the edges of your paving or patio.

How do you make herbicides more effective? ›

Add the appropriate additives as directed by the label. These may include spreaders, stickers, drift reducers, wetting agents, water conditioners, liquid fertilizer, etc. If an additive is recommended on the label, it is there to make the herbicide more effective.

What should you not do with a pressure washer? ›

9 Things That You Should Never Pressure Wash
  • Asphalt Shingles. You should not pressure wash asphalt shingles on your roof as it will remove the granules that protect your roof. ...
  • Stained Wood. It is also wise to avoid wood surfaces such as outdoor furniture. ...
  • Lead Paint. ...
  • Old Mortar. ...
  • Vehicle. ...
  • Windows. ...
  • Gutters. ...
  • AC Units.

What is the difference between a power washer and a pressure washer? ›

The main difference is that power washing uses highly pressurized steam to do the cleaning while pressure washing just uses unheated tap water, without the help of a heating element.

What kills weeds permanently? ›

Yes, vinegar does kill weeds permanently and is a viable alternative to synthetic chemicals. Distilled, white, and malt vinegar all work well to stop weed growth. Will table salt kill weeds? Yes, table salt will kill weeds.

What is the easiest tool to remove weeds? ›

Hoe (P) is a simple tool which is used for removing weeds and for loosening the soil.

What kills weeds permanently homemade? ›

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.

How do you get herbicides to stick to weeds? ›

Liquid dishwashing liquid can be added to a tank mix of the herbicide or pesticide being applied and mixed with water. A few drops in a 5L pressure sprayer or knapsack should be enough to help ensure that an efficient application is achieved.

How long do herbicides stay active? ›

Depending on the type of herbicide and the level of concentration in the soil, persistent herbicides can last anywhere from several months to three or more years before completely breaking down into inert compounds.

How can I make my Roundup more potent? ›

How to Make Roundup Work Better
  1. Use flat fan nozzles instead of drift reduction nozzles whenever the wind is relatively calm and out of the right direction. ...
  2. Spray when the weather is better. ...
  3. Keep your water volume low. ...
  4. Use the right rate. ...
  5. Spray weeds when they are small. ...
  6. Use REAL ammonium sulfate (AMS).
19 May 2015

How long can you continuously use a pressure washer? ›

Machine Type: Gas pressure washers can typically run for about 30 minutes before they need a break. Electric models can usually go for an hour or more. If you're using a hot water pressure washer, you'll need to give it breaks more frequently – about every 15 minutes.

What is the most common problem with pressure washers? ›

Many pressure problems begin and end at the unloader. A cracked o-ring, dirt caught in the spring or a stuck shaft are the most common issues solved by simply removing the unloader and cleaning/looking for issues.

What happens if you put your hand in front of a pressure washer? ›

The strong spray from a pressure washer can cause serious wounds that might first appear minor. Wounds that appear minor can cause a person to delay treatment, increasing risk for infection, disability or amputation. The fast, strong spray can throw objects that strike and injure others who are close by.

What is the best chemical to use in a pressure washer? ›

Sodium hypochlorite – disinfects and removes stains. Sodium hydroxide – dissolves grease and fats and works well on glass and steel. Bleach – sanitizes and disinfects aggressively.

What pressure washer do chemical guys use? ›

ProFlow PM2000 Performance Electric Pressure Washer | Chemical Guys.

How can I make my pressure washer spray harder? ›

In general, there are four ways to make a pressure washer more powerful. Using a different nozzle, changing the pressure regulator or unloader valve, using a different gas type, or tweaking the engine.

Does it hurt to run a pressure washer without water? ›

It Can Harm The Unit

A pressure washer requires water to cool and lubricate the pump, which is the part responsible for pushing water from the supply hose to the nozzle. Without water to cool and lubricate it, the pump will work harder than it should, causing it to wear down quickly.

What's the best PSI for a pressure washer? ›

2,000 - 2,900 PSI: This is a moderate strength unit used heavier residential tasks. These units are commonly sold as either electric or gas pressure washers. 3,000 - 6,900 PSI: These high pressure models are what professional pressure washers and contractors usually use.

Does psi matter in pressure washer? ›

When choosing a pressure washer, PSI and GPM are both equally important. The PSI refers to the amount of pressure produced and GPM refers to the amount of water flow. Each SIMPSON pressure washer is designed to have the correct combination of PSI and GPM to have the most effective cleaning experience for your needs.

What kills weeds permanently 2022? ›

Our top choice for eliminating weeds is Spectracide Weed and Grass Killer Concentrate. You can use it in many areas, such as flower beds, sidewalks, and even around shrubs, and it delivers visible results in just a few hours.

How do you get rid of weeds so they never come back? ›

Reapply herbicide to older and more established weeds to keep them from re-growing. Reapplying will weaken the weeds, eventually killing them. Vinegar may be more effective against weeds like immature dandelions and crabgrass with one application. Do not saturate weeds with herbicide.

What is the strongest weedkiller? ›

The best weed killer to buy
  • Resolva 20300467 24H Ready To Use Weed Killer, 3 Litre. ...
  • Roundup 119410 Path Weedkiller 5 Litre Pump 'N Go Refill, Ready to Use, Green. ...
  • Roundup 120023 Fast Action Weedkiller Pump 'N Go Ready To Use Spray, 5 Litre. ...
  • Neudorff Fast Acting & Long Lasting Weedkiller Concentrate 510ML.
29 Nov 2022

What kills weeds permanently but not grass? ›

Use A Selective Herbicide (2-4D Active Ingredient)

2,4-D is the more common selective herbicide. Using it properly has minimal risks and is extremely effective at killing weeds without killing your grass. Selective herbicide works by entering the leaf of the weed and changing the way the plant handles nutrients.

What are 3 ways of removing weeds? ›

Tilling: In this method, weeds are removed by uprooting or killing them before sowing the seeds. Manual labour: In this method, weeds are removed by uprooting them which are close to the ground, from time to time with the help of khurpi. Use of weedicides: Weedicide is a chemical used to remove weeds from the field.

What are the two methods of removing weeds? ›

The different methods of weed control are :
  • (a) Mechanical methods : Weeds can be removed by uprooting by hand or by using trowel. ...
  • (c) Chemical methods : Weeds can be destroyed by spraying chemical called weedicides.
  • (d) Biological methods : Certain insects and crop plants prevent the growth of weeds.

Is vinegar as good as Roundup? ›

When equal amounts were given orally and compared, it took less acetic acid to kill rats in the laboratory test that it did glyphosate. The acetic acid in even household vinegar was MORE toxic than Roundup!

How do I permanently get rid of weeds in my gravel driveway? ›

Salt: Spreading iodized salt on the gravel will kill weeds, but it will sterilize the ground for years to come, so use it sparingly. Boiling Water: Another way to kill weeds naturally is to pour boiling water over them. By Hand: If there aren't many weeds in your gravel, it's best to pull weeds out by hand.

What can I use instead of Roundup? ›

Spraying a little white vinegar onto the leaves of weeds can keep them under control as well. Grocery store vinegar will do, but more acidic vinegar is also available at your local home and garden store. You can also combine a little rock salt with the white vinegar for added weed-killing power.

Will Dawn dish soap work as a surfactant? ›

A common “trick” used when spraying weeds around your home may be to add a few drops of dish soap, such as Dawn®. Dish soap is used as a surfactant, both when washing dishes and applying herbicide to plants.

What can I add to herbicide to make it stick? ›

Adding just a dash of surfactant can increase the effectiveness of all your herbicide applications. A surfactant, a combination of the words “surface active agent,” is an organic compound that is soluble in chemical solutions or water and allows mixtures to blend, adhere and work better.

What time of day do you spray weeds? ›

University studies show crop weed herbicide applications made early in the morning when the winds not blowing typically gives much less control than that same application later in the day.

What is the best time of day to apply herbicide? ›

In both the burndown and in-crop studies, the most effective timing was usually midday, followed by midnight. Coles says, “Since night spraying was usually more effective than dawn, night spraying could be a good option when daytime opportunities for spraying are limited.”

What factors cause herbicides to fail? ›

Herbicide failure can occur for reasons other than herbicide resistance, including application error, adverse environmental conditions and plant stress.

Can herbicides be washed off? ›

No method is 100% effective. As a rule of thumb, washing with water reduces dirt, germs, and pesticide residues remaining on fresh fruit and vegetable surfaces. Washing and rubbing produce under running water is better than dunking it.

Why doesn t Roundup work anymore? ›

Weed killers may also fail if they have been in storage for a long period of time. If herbicides are stored in outside sheds, freezing or extremely hot conditions can cause the active ingredient to become ineffective. Check the label to see under what conditions the herbicide can be safely stored.

Does Roundup lose its strength over time? ›

Does Roundup Expire? Roundup does not expire overnight the way, say, milk does. But it does lose its efficacy over time. Fortunately, Roundup products last for several years after purchase when stored properly.

What happens if you mix Roundup to strong? ›

if you mix the roundup like the instructions states or make it a little stronger it will kill anything.

How long can you run a pressure washer without pulling the trigger? ›

DON'T Let the Machine Run Too Long Without Pulling the Trigger. Pressure washers operate under pressure, and that pressure needs to be released by pulling the trigger. If you let the machine run for two minutes or longer without spraying water, then you could damage the pump.

Can I pressure wash with just water? ›

Pre-washing with the right detergent helps to begin breaking down the algae, rust, dirt, or oil stain before pressure is even applied. Pressure washing without detergent is like showering without soap. Sure, water and scrubbing will get the job done, but it's not the same without soap!

Why you should not pressure wash your house? ›

Your house is built to withstand rain and other moisture, and it can even withstand a low PSI with a pressure washer, but when pressure washers are used at full capacity, you may end up with soggy carpet, wet attics, and mold. When done incorrectly, a pressure washer can damage siding, even knocking it loose.

How many times a year should you pressure wash? ›

A Part of Routine Maintenance

As a general rule, most experts recommend that you wash your home every 6 to 12 months (or one to two times a year). By power washing your home on a regular basis, you can protect it from the onset of mold or mildew and maintain its beautiful appearance. Nothing is set in stone, of course.

Can 30 seconds be used in a pressure washer? ›

Q: Can I use 30 SECONDS Outdoor Cleaner in my pressure washer? A: Preferably Not. The cleaner needs to stay on the surface to clean and soften the grungy grime and dirt build-up. 30 SECONDS Outdoor Cleaner works best when it is applied first and then rinsed off with a hose.

What PSI breaks skin? ›

In order to breach the human skin the ejection pressure has to be at least 100 pounds per square inch (psi)8 while most high-pressure guns and injectors reach pressures of 2000 to 12000 psi3. The puncture wound is small, inconsiderable and not distinct.

At what temperature should you not use a pressure washer? ›

Ideally, you would pressure wash your house between March and November. But, if you must do it during the wintertime, make sure to avoid temperatures below 40 degrees. If the temperature is too cold, it could damage your pressure washer, put you at risk, and freeze the surfaces you wash.

Can a pressure washer draw from a bucket? ›

How can I use a Pressure Washer from a rain water tank or bucket? Pressure Washer's are commonly connected to a running tap via a hose; however they can also draw water from sources such as a rain water tanks & garden bucket with the same performance.

Can you turn a pressure washer into a water pump? ›

A sludge pump kit easily converts a pressure washer into a light duty water pump. The kit comes with a sludge pump, 25 ft discharge hose, 18” suction hose, and hose clamps. It quickly connects to a standard 1/4” coupler. This transfer pump is ideal for tank filling, floodwater removal, and lawn and garden watering.

Can a pressure washer draw from a tank? ›

Can I gravity feed my Pressure Washer from a water tank? Generally, you can gravity feed a pressure washer from a water tank. Ensure that the pressure and amount of water coming from the tank is sufficient for your pressure washer model. If this is not the case, increase the height of the tank to increase the pressure.

Can you hook a pressure washer gun to a water hose? ›

One set of connectors connects your spigot and your garden hose. Another set of connectors connects your garden hose to the pressure washer, then the third set connects your high-pressure hose to your pressure washer pump. Some kits even come with a connector for attaching your spray gun to your high-pressure hose.

Why can't you run hot water through a pressure washer? ›

One can run warm water through a cold water pressure washer safely up to 150 degrees Fahrenheit – 65 degrees Fahrenheit. You cannot run hot water, especially at extremely high temperatures, through your cold-water unit. You could potentially melt the seals in the pump, and overheat the unit.

How long can you continuously run a pressure washer? ›

Machine Type: Gas pressure washers can typically run for about 30 minutes before they need a break. Electric models can usually go for an hour or more. If you're using a hot water pressure washer, you'll need to give it breaks more frequently – about every 15 minutes.

Can pressure washing damage a well pump? ›

If your home has a low yield well, and you choose to power wash without taking the proper procedures or calling a professional company, you can run out of water in the home, do major damage to your pump and also cause major damage to our equipment.

How much water pressure do I need to run a pressure washer? ›

Most pressure washers have a minimum water flow requirement (2.5 GPM for gas pressure washers, 1.5 GPM for electric pressure washers) enabling the unit to perform at its listed pressure.

Do I need a pump between water tank and pressure washer? ›

Generally, you will need an extra pump between the tank and pressure washer if the current pressure is not enough. If you can see that the water pressure you're getting isn't strong enough, using a regular water pump will help to increase it.

Why can't you run bleach through a pressure washer? ›

Never Use Bleach with Pressure Washers

Bleach will corrode your pump's seals and essentially render the pressure washer useless. Bleach is a dangerous chemical, and spraying bleach means propelling bleach into the air.

Can you run 2 guns on pressure washer? ›

This Two-Gun Tee Coupler converts a one-gun pressure washer into a two-gun system. This is a good way to power wash on a big job if you don't have 2 machines.

What is the best hose to use with a pressure washer? ›

Overall, the best size garden hose to use with a pressure washer is 1 ¼ inches because it allows for the strongest water flow without any loss of power.

Can you attach a foam cannon to pressure washer? ›

Here at Detail Garage, we use both gas and electric pressure washers to shoot thick car washing foam, and all Chemical Guys foam cannons work with gas or electric pressure washers. All you have to do is make sure your specific pressure washer falls within the PSI and GPM requirements of the foam cannon!


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