Kill Weeds With Vinegar

Vinegar contains acetic acid and is an effective, and natural, weed killer. It is favored by many gardeners because it has less harmful effects that herbicides. You can use a pump sprayer to spray vinegar directly onto any weeds, carefully avoiding the plants you want to keep. For tougher weeds, you can buy stronger horticultural vinegar, add some dish soap, or add salt to your vinegar before you spray your weeds.

Steps

Using Vinegar as a Weed Killer

1. Buy white vinegar. Go to your local grocery store and buy a bottle of basic vinegar, typically a 5% concentration of acetic acid. The best bargain is probably to buy a one gallon jug unless you only have a few weeds. If you are killing a lot of weeds, you may need to buy more than one gallon, but one gallon will cover a large area.
   • The acid in vinegar is what kills the weeds. White vinegar is most recommended, and probably the cheapest, but you can use apple cider vinegar as well.
2. Pour the vinegar into a garden sprayer. Choosing a pump sprayer with a hose and long nozzle will make spraying large areas of weeds easier. Fill the sprayer up with vinegar, or put as much vinegar in the sprayer as you’ll need.
   • Another option is to pour the vinegar into an empty spray bottle. You can buy an empty bottle or you can use a bottle that used to contain window cleaner or another gentle household cleaner. Make sure to rinse it out well if you use a bottle that had other liquid in it.
   • If you are only killing a few weeds, or covering a small area, you can poke four or five holes in the cap of the vinegar bottle and use the bottle to douse the weeds.
   • You have the option of diluting the vinegar with water, which is sometimes recommended, but diluting only makes the vinegar weaker. Some weeds are easy to kill with diluted vinegar and others are more stubborn.
3. Choose a sunny day to spray weeds. The acetic acid in vinegar dries weeds out, so applying vinegar on a day when the weeds will get at least a few hours of direct sunlight increases the drying power of the vinegar. Spray in the morning so the weeds can get lots of sun.
   • If it rains unexpectedly shortly after you spray the weeds, you’ll most likely have to apply a second round of vinegar.
   • In this case, sunny means hot as well, ideally in the range of 70+ degrees.
4. Spray directly onto the weeds. Using the pump sprayer, spray bottle, or vinegar bottle with holes, thoroughly douse the weeds you want to kill. Cover the leaves with vinegar, but also spray down around the roots.
   • You don’t need to soak them so they are dripping wet but spray an even coat.
   • Wait around 24 hours and check the weeds. If you aren’t satisfied, you can spray the weeds a second time.
5. Avoid spraying vinegar on desirable plants. Vinegar kills crops and flowers as well as weeds, so take care any time you are spraying weeds around good plants. Vinegar is not always a good option if you are spraying weeds in a garden, flower bed, or in your yard.
   • Vinegar shouldn’t soak into the soil and kill other plants unless it makes direct contact with them.
6. Clean the sprayer out after you finish. Vinegar can corrode your sprayer if you let it sit for a long time. Carefully rinse your sprayer out after every use. Dump the excess vinegar out and then fill the sprayer with water. Be sure to pump and spray the water to clean out the hose and nozzle.

Killing Stubborn Weeds

1. Buy 20% concentrated horticultural vinegar. Go to a garden store or home improvement store and ask if they have concentrated vinegar products designed for garden use. When using stronger vinegar, it is advised to take extra caution such as wearing gloves and goggles.
   • Most weeds will die with regular vinegar, so use that first and only use horticultural vinegar if regular doesn’t work.
   • Be careful not to get any on your skin as it can cause burns because of the higher concentration of acetic acid.
2. Add dish soap. Mix some dish soap into your sprayer or spray bottle. Using around a teaspoon (5 ml) per quart (liter) of vinegar is a good amount. The dish soap will help the vinegar stick to the weeds and not run off.
   • Gently stir the soap into the vinegar, but don’t shake the bottle too much or the soap will get sudsy rather than mixing into the vinegar.
   • It is not necessary to carefully measure out the dish soap. Squirt an amount that seems close to a teaspoon per quart.
3. Add 2 cups (473 ml) of table salt to a gallon (3.8 L) of vinegar. Salt may not affect all weeds, but it can dry out some weeds faster than plain vinegar. You can add salt to the mixture that already has dish soap in it. Use cheap table salt rather than rock salt, Epsom salt, or sea salt.
   • Salt tends to stay in the soil for a while and can have long-term effects on healthy plant life. If you are killing weeds in an area where you’ll plant again, it is probably best to avoid the salt.
   • On the other hand, if you are killing weeds in an area that you want to prevent future growth, salt can help achieve this.
   • It is especially important to clean a sprayer in which you added salt because it will clog up the parts and can even corrode the sprayer.

Things You'll Need

• White distilled vinegar
• Pump sprayer/spray bottle
• Dish soap (optional)
• Table salt (optional)

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