Homemade Weed Killer: Vinegar, Epsom Salt & Dawn Dish Soap

By PropertyClub Team
May 27th 2024
You can make a homemade weed killer with just three ingredients: white vinegar, Epsom salt, and Dawn dish detergent. But how effective is this combination at killing weeds, and how should you apply it?

hash-markVinegar, Epsom Salt, & Dawn Dish Soap Homemade Weed Killer Recipe

One of the most reliable weed killer recipes consists of mixing vinegar with dawn dish detergent and Epsom salt. Read on to find out how to make this potent weed killer.

Weed Killer Ingredients

  • 2 cups Epsom salt
  • 1 gallon of white vinegar, 5 percent dilution
  • ¼ cup Dawn dish detergent

Vinegar, Dawn, Epson Salt Weed Killer Instructions

  1. Pour the vinegar, Dawn, and Epsom salt into a large bowl 
  2. Mix the solution up until combined and let it settle for 2 minutes
  3. Pour into a spray bottle and use on any weeds you may have
  4. Respray the weeds the next day

You can expect most weeds to start to die out within a few days. With that said, this weed killer can be a skin and eye irritant. If you want to use it, make sure that you don’t have pets wandering your yard when you do.

hash-markHow Effective Is Vinegar, Epsom Salt & Dawn Weed Killer?

Vinegar, Epsom salts and Dawn liquid dish soap makes a very effective weed killer. The more concentrated the vinegar is, the more effective it will be at killing weeds. If the vinegar is too diluted or if you use your vinegar solution in inclement weather, you won’t get good results. So while it can be very effective, it’s not going to be the strongest thing you can use.

One thing you need to keep in mind is that vinegar weed killer might often only kill superficially. Unless the solution gets soaked down to the root, you will not be able to kill the entire plant. 

hash-markIs Vinegar Based Weed Killer Safe to Use?

In general, vinegar based weed killer is safe to use. However, this depends on how concentrated the vinegar is, as well as how much Epsom salts you’re using to further desiccate the plants you want to kill. Vinegar is an acid, and salt actually further bolsters the burn acid has.

There have been some cases where people have used 20 percent concentrated vinegar to make a weed killer. While it did kill the weeds, it also caused chemical burns on their hands as a result of the high acid content. 

If you have pets, sensitive skin, or intend on using a highly acidic recipe for your own homemade weed killer, we strongly suggest against it. High concentrations of vinegar can burn skin, harm eyes, and if you have pets, potentially cause breathing problems. 

hash-markDoes Vinegar Kill Grass?

Yes, vinegar weed killers kill grass. Vinegar is an acid that damages and breaks down organic matter. A big problem with homemade vinegar weed killers is that they don't discriminate on what they kill. While vinegar weed killers will kill weeds, they will also kill other foliage. If you spray your DIY weed killer on dandelions, it’ll kill dandelions. If you spray it on grass? Well, you’re going to have a large, dried-out patch of grass sooner rather than later.

Since vinegar kills grass too, you should not try to “blanket bomb” your lawn with a vinegar weed killer. This will cause way more damage than anyone would want in their yard. If you need an herbicide to kill off weeds without killing grass, make sure you apply it correctly to avoid damaging your grass. 

hash-markWhen Should You Spray Your Vinegar Epsom Salt Weed Killer?

Making the vinegar Epsom salt weed killer is only half the battle. The other half of the battle involves applying it correctly. When you’re using a weed killer, it’s important to keep these things in mind:

  • Try to spray your weed killer in the afternoon. You can expect the best results around midday as there will not be any dew or moisture that could dilute the weed killer. 
  • Use your weed killer on hot, sunny days. This is the best way to ensure that your weeds will actually get the desiccation required for a full kill. If you are trying to use it in cold temperatures, you will be disappointed. 
  • Remember to pull the weeds out after they’ve died. This ensures that you will have less regrowth. 

hash-markShould You Use a Vinegar, Epsom Salt & Dawn Weed Killer?

If you are looking for a quick fix and don’t mind having a risk of collateral damage once in a while, creating a vinegar, Epsom salt, and Dawn weed killer isn’t that bad an idea. It can actually be an effective way to kill weeds, or at least make them more manageable. 

Unfortunately, a weed killer made from vinegar and Epsom salt isn’t the healthiest for your lawn. If you want to keep it lush, you might want to choose a more plant-specific solution.

hash-markDoes Vinegar Kill Weeds on its Own?

Yes, vinegar kills weeds, but its effectiveness depends on the concentration and the situation you’re dealing with. You can mix vinegar with Epsom salt and dish soap like Dawn for a more potent weed killer.

Vinegar based weed killers typically work by drying out the leaves of weeds in hot, sunny weather, so it’s best to use them during the summer. Midday is the best time to apply a vinegar weed killer as the sun is at its strongest, and you won’t risk diluting it with morning or evening dew. 

hash-markVinegar Based Epsom Salt Weed Killer Bottom Line

Mixing vinegar, Epsom salt, and Dawn dish soap creates an effective weed killer. This DIY weed killer can damage any plant it’s sprayed on, therefore, it must be used and handled wisely. If you have pets or sensitive skin, take extra precautions as it can be corrosive to the skin. In order to see the full effects of the solution, ensure it is sprayed directly onto the roots of the targeted plants. If you are worried about this solution ruining your lawn, then opt for a more plant-specific solution.