How to Make Natural Weed Killer

By: Christine Hennessey How to, Natural

Dandelions. Crab grass. White clover. Common ragwort. They’re a nuisance to gardens, stealing nutrients, sunshine, and space from native plants and vegetables. Getting rid of them is no picnic, either—weeding by hand is a battle you’ll never win. When it comes to eradicating weeds from your garden, only a highly effective weed killer will do.

Just stroll down the lawn care aisle of your local big-box store and you’ll find numerous chemicals that will get the job done, but there are plenty of all-natural, DIY options available. They’re often cheaper, too.  

My mother-in-law, who has the greenest thumb in Illinois, swears by a homemade herbicide made from the ingredients listed below. While she recommends grinding up your own homegrown chilies, store-bought will work just fine.

Vinegar is the key ingredient here. Because it’s an acetic acid, vinegar kills plants by drawing moisture out of the leaf. This means it won’t kill the roots, which is a good thing—if this weed killer penetrates the soil, it would kill beneficial microorganisms and put the roots of good plants at risk, too. If your weeds are well established, simply keep an eye on their growth and reapply as necessary.


  • Large glass bowl
  • 1 spray bottle
  • 1 pair heavy duty rubber gloves
  • 1 gallon hot water
  • 4 cups cleaning vinegar
  • 1 tablespoon dish soap
  • 1 cup salt
  • 1/3 cup chili powder

How to Make the Weed Killer

  1. Mix the ingredients well and allow the mixture to cool to room temperature.
  2. Wearing rubber gloves, carefully pour the solution into a spray bottle.

Applying Your Weed Killer

This weed killer should be applied on a nice, hot, sunny day, when the soil is dry and the temperature is at least 70ºF. This weed killer isn’t picky, so be careful where you point your bottle, aiming only at the leaves of the weeds you want to kill.

Storing Your Weed Killer

Because you probably won’t use all the weed killer at once, store any extra in a container this highly acidic mixture can’t corrode, such as glass or certain types of plastics, like polyethylene. This will ensure it’s ready to go next time you need it.

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