How to Kill Weeds with Vinegar the Right Way

Vinegar can help get rid of weeds, but there is a catch.

Everyone hates weeds. If you walk down the gardening aisle at your local nursery or big box store, you will see all sorts of weed killers to choose from. Homemade concoctions for killing weeds are popular too. Natural weed killer made with household vinegar have become especially popular on the internet.

But if you just fill a bottle with regular vinegar from under your sink and start spraying weeds, you are going to be disappointed.

If you are going to use vinegar as a weed killer, there are a few things you need to know first.

Don’t Use Household Vinegar

The typical household vinegar is great for cleaning, but it is  not strong enough to kill weeds . White vinegar usually contains  five percent acetic acid . To kill weeds, you will need something stronger.

Vinegar Type

Acetic Acid Content

Effectiveness on Weeds

Household vinegar

5%

Not effective

Horticultural vinegar

20%

Effective on young, annual weeds

Important:  Horticultural vinegar is particularly strong. If you are going to use it, you will need to wear  gloves and eye protection . Some horticultural vinegars come premixed and ready to use, which is probably the easiest way to go.

What to Know About Vinegar Weed Killer

While there are other natural, safe options for taking care of those pesky weeds, if you decide to use vinegar, there are a few things you need to keep in mind.

Consideration

Detail

Roots are not killed

Vinegar only kills the parts of the plant it touches (contact herbicide)

Annual vs. perennial

Vinegar-based herbicides will only kill annual weeds, not perennials

Temporary effect on tough weeds

It might temporarily take care of poison ivy or ragweed, but those plants will be back soon enough

Legal note

If you purchase horticultural vinegar that is not labeled as a weed killer, it is illegal to use it as a weed killer

Vinegar is a chemical

Treat it as such—you will need safety gear for handling herbicidal versions with 20% or more acetic acid

Off-target damage

Vinegar can kill the plants you do not want to harm, so be careful where you spray it

Wind

Do not use it on a windy day

Surface damage

Be careful with strong vinegar around your patio—it can discolor certain kinds of decking materials

How to Make Your Own Vinegar Weed Killer

If you do want to make your own vinegar weed killer, the main thing to remember is that you will have to use vinegar that is stronger than the household variety. You can buy concentrated vinegar that is  20 percent acetic acid .

Beyond the vinegar, you will also need dish soap, salt, and a spray bottle.

Ingredient

Purpose

Acetic acid (vinegar)

Breaks down plant cell walls

Salt

Works with acetic acid to dry out the plant

Dish soap

Breaks down the outer coat of the plant (cuticle), helping the vinegar penetrate

DIY Weed Killer Recipe

Ingredient

Amount

Horticultural vinegar (20% acetic acid)

1 gallon

Dish soap

1 ounce

Salt

1 cup

Directions

Step

Action

1

Mix the vinegar, salt, and soap together

2

Pour into a spray bottle

3

Spray  directly  onto weeds

4

Apply on a  sunny day with no wind

Why sunny and calm matter: The sun helps the vinegar dry out the weed. Waiting for a windless day also means your spray will not inadvertently land on other plants.

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Ways to Get Rid of Weeds Naturally

Method

Effectiveness

Best For

Hand pulling

Most effective

All weeds (especially after rain)

Digging with a patio knife or garden hoe

Effective for deep-rooted weeds

Stubborn, established weeds

String trimmer

Good for large areas

Weeds in hard-to-reach spots

Vinegar spray

Effective for annual weeds

Young weeds; sunny days

The best natural method:  There is still nothing more effective than pulling them out by hand, root and all. It is a little easier to do after it rains. For the really stubborn ones, you can dig them out with a patio knife or a garden hoe.

Prevention: The Best Defense

An ounce of prevention goes a long way toward keeping weeds out, too. While there is no way to keep weeds out entirely, understanding soil health and planting wisely can prevent a complete takeover.

Prevention Strategy

How It Helps

Maintain healthy lawn

Dense grass crowds out weeds

Apply mulch

Blocks sunlight from weed seeds

Water deeply and infrequently

Encourages deep roots in desired plants

Mow at proper height

Taller grass shades soil and prevents weed germination

Regular soil testing

Ensures proper pH and nutrient balance

Quick Reference: Vinegar Weed Killer Do’s and Don’ts

Do

Don’t

Use 20% horticultural vinegar

Use household 5% vinegar

Wear gloves and eye protection

Spray without protective gear

Apply on sunny, windless days

Spray on windy or rainy days

Spray directly on weeds

Spray desired plants

Use as a spot treatment for annual weeds

Expect it to kill deep-rooted perennials

Combine with salt and dish soap

Expect plain vinegar to be effective

Treat vinegar as a chemical

Assume it is completely harmless

Final Thoughts

Vinegar can be an effective natural weed killer—but only if you use it correctly. Household vinegar will not work. You need horticultural vinegar with at least 20% acetic acid, and you need to understand its limitations.

Vinegar Weed Killer Is Good For…

Vinegar Weed Killer Is Not Good For…

Annual weeds

Perennial weeds (roots will regrow)

Young, tender weeds

Established, woody weeds

Spot treatment in driveways and patios

Large lawn areas

Sunny day applications

Rainy or humid conditions

Remember:  Vinegar is a chemical, even if it is natural. Treat it with respect, use proper safety gear, and apply it carefully. When used correctly, it is a valuable tool in your weed-fighting arsenal.

A weed-free lawn is a marathon, not a sprint. Vinegar can help you win a battle, but consistent care wins the war.