Diesel Kill Weeds

Does Diesel Kill Weeds? If So, What’s The Best Way To Apply For It?

7 minutes

Are you wondering how to get rid of weeds in your garden to keep it beautiful and clean? You might have heard about using diesel gasoline to kill off any of this unwanted grass and get rid of weeds for good. But let’s discuss, does diesel kill weeds

Well, diesel is a toxic substance that eventually kills grass, but it’s not a permanent solution. While using diesel in your lawn, you need to be very careful to not damage any valuable crops and seeds. 

We’ll guide you through a step-by-step outline on how to kill unnecessary weeds. We’ll also provide some valuable safety measures for using diesel, so stick with us! 

Steps To Use Diesel To Kill Grass

Diesel is toxic to grass, and other crops as well. Pouring diesel into the soil can destroy entire plants and animals. So, for this reason, be careful to avoid the other crops and plants when spraying diesel to kill weeds. 

Also, it’s important to note that diesel won’t provide a permanent solution to removing weeds and grass. Once the amount of diesel is reduced from the soil, the weeds will gradually start to grow back. So, if you want to prevent them from growing back, you need to spray diesel fuel seasonally. 

In the following section, we’ll go over step-by-step instructions on how to spray diesel for killing weeds. 

Diesel Kill Weeds

Necessary Materials- 

  • Diesel: Just get 2-3 gallons of diesel fuel from any gas station or nearby mechanical shop. 
  • Gasoline jug: Get a gasoline jug for storing and carrying the diesel fuel.
  • Spray bottle: You will need a thick spray bottle with a spray nozzle that is suitable for containing diesel fuel. 
  • Funnel: A strong plastic funnel is required to pour the diesel into the spray bottle. 
  • Sand: In case you accidentally pour diesel into your soil, then sanding on the area will help to prevent it from destroying the grass. 
  • Shovel:  You will need a shovel to remove and clean the dead weeds and grass from the garden or yard. 

Step By Step Guide 

  1. Check the weather forecast

Firstly, check the weather before you go any further in this process, as you need to make sure that there isn’t any heavy wind or rain for the next 2-3 days after spraying. 

This is important because the diesel will not be effective in killing off weeds if it is washed away by water too soon. Moreover, washed-away diesel will run on to other areas and will result in killing all surrounding crops and plants, which is not what you want. 

  1. Prepare your spray bottle 

Secondly, put on a mask and gloves to ensure your safety. Then, you will need 3 gallons of diesel gasoline and fill the gasoline jug with it. Now, fill the spray bottle with the fuel using a funnel. We would advise filling the spray bottle over an area that has a concrete floor, such as a garage so that you do not spill the toxic fuel onto your garden or lawn. 

  1. Spray the diesel

It’s time to spray on your undesirable grass or weeds. Spray the diesel directly onto the roots of the weeds.

Spray just until the roots and leaves are wet, but don’t spray too much. If the soil becomes too saturated it will kill the neighboring crops and plants. The less you spray, the easier it will be for you to keep the other plants safe. 

Additionally, it’s always recommended to kneel down and spray the weed as close as possible in order to prevent spraying to surrounding plants and insects.  

  1. Cleaning the bottle 

Once this is done, it’s important to clean the spray bottle carefully. Storing diesel for a long time in the plastic spray bottle may gradually damage the bottle. It’s best to store the remaining fuel in the gasoline jug, then carefully clean the spray bottle and funnel. 

  1. Removing the dead grass and weeds

After spraying the diesel on the weeds, you have to allow a few hours it to work properly. After that, you have to remove them. Take at least one inch of the soil using a shovel and remove the grass along with its roots. This will help to stop groping new weeds for at least one season. 

In case you accidentally spill some diesel onto any unwanted area, pull out at least 2/3 inches of soil from that area and cover it with sand. This will prevent contaminating any of the neighboring soil in the garden. 

How Long Does It Take To Kill The Weeds?

Using diesel generally takes 3 or more days to kill all the weeds completely. However, within a few hours, the weeds will start to wilt from their initial state. Before removing the grass, in order to kill them completely, the diesel needs to keep in contact with the roots for a minimum of 48 hours. After this time period, you can remove the dead grass.  

You will need to seasonally spray the weeds to properly remove them. Furthermore, if you have long, grassy weeds which are very long and grow faster, make sure that you’re properly covering them with diesel to kill them. 

Kill The Weeds

The Most Effective Way To Kill Weeds Using Roundup And Diesel 

Diesel will not provide a quick and permanent solution to getting rid of weeds, but combining diesel and roundup herbicide will execute a much more effective result. Interesting! Right? 

Yes! Roundup is an effective weed killer itself and you would see the result within three hours of applying. Mixing roundup and diesel is great when it comes to killing weeds; roundup quickens the killing process and diesel thoroughly kills the weeds. 

In fact, the combination of these weed killers can provide a long-lasting result. 

Safety Measures Of Using Diesel To Kill Grass

It’s important to follow some precautions before and after applying diesel onto the grass. 

In this section, we will provide a guideline on safety measures to consider. 

  1. Try to spray the diesel early in the morning and check the weather forecast before preparing. The best time for sparring diesel is a sunny day. 
  2. Don’t spray diesel around a fire, as it’s a fire hazard. 
  3. Wear a mask and protective gear to prevent inhaling fumes that can irritate while spraying. 
  4. Always take your surrounding area into consideration before applying diesel. If you have any groundwater water sources like wells, ponds or any streams, avoid using diesel around that area. It is really important to avoid water contamination. 
  5. Don’t spray on the good plants and flowers, as it will damage all of the plants. Moreover, it is also harmful to animals and insects. So, it’s always advisable to keep animals away from that area. But still, if your pet or any other animal is coughing or feeling sick after applying diesel, it’s better to give treatment as soon as possible to a veterinarian. There is no home treatment for the diesel toxicity of your pets. 
  6. Once the spraying is done, transfer the leftover diesel to the gasoline jug and store it in a dry place. 
  7. Seal the spray bottle and gasoline jug so that they can’t be used for any other purpose. 
  8. Lastly, keep kids away from the area before and after you spray. 


We hope the above details have provided a clear answer on whether diesel kills weeds and how to properly use it to benefit your garden. Although diesel is an effective toxic fuel to kill weeds, it must be used very cautiously. 

Furthermore, before applying diesel, you need to be sure what you want to eliminate from your garden and the specific areas you will be tending to.

Lastly, follow each safety precaution until all of the weeds have been eliminated. It’s important to maintain safety for yourself, but also to keep your yard neat and beautiful.

Todd L Miles
Lawn Mowers Enthusiast
I started "Landscape and Lawns Care" to provide clients with lawn care with better service, better products and, most importantly, better ethics. My promise to every customer is to give the greenest grass possible while controlling weeds, insects, and diseases! The most important thing is that I strive to always do the right thing for you, your lawn and your wallet!