To make weed killer with vinegar, combine 1 gallon of 45% concentrated vinegar, 1 cup of table or rock salt, and half a teaspoon of liquid dish soap per quart. Pour into a pump or trigger sprayer, shake until the salt dissolves, and apply undiluted directly to weed foliage on a hot, sunny day. That is the complete recipe for how do I make weed killer with vinegar. For the full guide covering all three recipe variants and every scenario, see Vinegar and Salt Weed Killer: Does It Work? The sections below explain why each ingredient matters, how to mix safely, and what to do if the weeds come back.
TL;DR
- Full recipe: 1 gal 45% concentrated vinegar + 1 cup salt + 0.5 tsp dish soap per quart. Mix in a sprayer and apply undiluted.
- Use 45% concentrated vinegar, not 5% grocery vinegar. At 5%, the formula is too weak to kill weed roots reliably.
- Apply on a hot, dry, sunny day with no rain forecast for 24 hours. Annual weeds die within 24 to 48 hours.
- Leave out the salt if treating soil you plan to replant. Salt persists and prevents future plant growth.
- Nature's Freedom 45% Concentrated Vinegar is NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals and made in the USA. Shop at naturesfreedom.com/products/45-percent-vinegar-1-gallon.
Quick Recipe Reference
|
Ingredient |
Amount |
Purpose |
|
45% concentrated vinegar |
1 gallon |
Primary active agent - kills weed tissue on contact |
|
Table salt or rock salt |
1 cup |
Amplifies kill; creates soil salinity that prevents regrowth |
|
Liquid dish soap |
0.5 tsp per quart |
Surfactant - helps formula stick to waxy or smooth leaves |
Salt Warning: Leave out the salt if treating soil near garden beds, lawn edges, or any area you plan to replant. Salt accumulates and can prevent plant growth for months to years. Use the full salt recipe on driveways, pavers, and permanent no-grow zones only.
Why This Recipe Works
The vinegar concentration is the most important variable. Research published in Weed Technology (Weed Science Society of America) found that acetic acid below 20% does not reliably kill weed roots. According to PubChem (NIH) - Acetic Acid, at 45% concentration the acid penetrates deep enough into the crown to significantly reduce root regrowth. For the full concentration breakdown, see What Concentration of Vinegar Kills Weeds?.
|
Ingredient |
Why It Works |
|
45% vinegar (acetic acid) |
Strips moisture from plant cells on contact, disrupting the cell membrane. At 45%, penetrates into the crown to reduce root regrowth. |
|
Salt (sodium chloride) |
Draws additional moisture from plant tissue through osmosis. Creates saline soil that prevents seed germination and new root growth. |
|
Dish soap (surfactant) |
Reduces surface tension of the liquid so it adheres to leaf surfaces instead of beading off. Especially effective on grasses. |
Nature's Freedom 45% Concentrated Vinegar is NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals and is the recommended base for this recipe.
How to Make Weed Killer with Vinegar: Step-by-Step Mixing
Safety: 45% concentrated vinegar is a corrosive irritant. Always wear nitrile or rubber gloves and safety glasses when mixing and applying. Keep children and pets away from treated areas until fully dry.
1. Pour 1 gallon of 45% concentrated vinegar into a pump or trigger sprayer rated for acidic solutions.
2. Add 1 cup of table or rock salt. Seal the sprayer and shake vigorously until the salt is fully dissolved. Undissolved salt will clog the nozzle.
3. Add half a teaspoon of liquid dish soap per quart. Shake gently to avoid excess foam.
4. Label the sprayer clearly as weed killer. Do not use the same sprayer for any other garden product without thorough rinsing.
How to Apply for Best Results
- Apply on the hottest, sunniest part of a dry day. Heat and UV accelerate the desiccation effect.
- No rain for at least 24 hours after application. Rain dilutes the formula before it can act.
- Spray directly onto weed foliage. Coat leaves and stems thoroughly. Focus on the crown at soil level.
- Vinegar is non-selective. Keep spray targeted to avoid damage to desirable plants and grass. The EPA classifies acetic acid as a minimum-risk pesticide active ingredient - no re-entry interval required once the surface is fully dry.
- Check results after 48 to 72 hours. Annual weeds should be dead. Repeat on perennial regrowth every 5 to 7 days for 2 to 3 rounds.
What If the Weeds Come Back?
Vinegar is a contact herbicide. It kills what it touches but does not travel through the plant to the roots the way synthetic systemic herbicides do. Perennial weeds with deep root systems will die back at the surface but push out new growth from surviving roots within one to two weeks. This is normal. For a full comparison of natural vs synthetic weed control options, see How to Make Natural Weed Killer with Vinegar.
For perennial weeds, apply to each new flush of growth every 5 to 7 days. After two to three rounds, the root system is typically exhausted and does not produce further regrowth. For fastest results on tough perennial weeds, combine repeat vinegar applications with manual root removal. Read our 45% concentrated vinegar guide.
The Bottom Line: How Do I Make Weed Killer with Vinegar?
Making weed killer with vinegar takes three minutes and three ingredients. Start with Nature's Freedom 45% Concentrated Vinegar, NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals, as the base. Add salt for driveways and permanent zones, leave it out near garden soil, and apply on a hot, sunny day. For the full recipe with all three variants, see Vinegar and Salt Weed Killer: Does It Work? Browse the full range or contact Nature's Freedom.
Frequently Asked Questions
1. What is the simplest vinegar weed killer recipe?
The simplest recipe is 1 gallon of Nature's Freedom 45% Concentrated Vinegar in a sprayer, applied undiluted. Adding salt (1 cup per gallon) and dish soap (0.5 tsp per quart) improves results, but the vinegar alone is effective on most annual weeds when applied at full strength on a hot, sunny day.
2. Can I make weed killer with the white vinegar in my kitchen?
Kitchen white vinegar is 5% acetic acid. At that concentration, you will see surface burn and temporary wilting, but the root system survives and the weed recovers within days. For a recipe that kills weeds at the root, you need a minimum of 20% acetic acid, with 45% delivering the best results. Kitchen vinegar is not a reliable substitute.
3. How long does homemade vinegar weed killer take to work?
On annual weeds, visible wilting starts within 2 to 4 hours on a warm, sunny day. Full brown-out typically occurs within 24 to 48 hours. Perennial weeds die back at the surface over the same timeframe but push out new growth from surviving roots within one to two weeks, requiring repeat applications.
4. Is homemade vinegar weed killer safe around pets and children?
Once dried, acetic acid breaks down into water and carbon dioxide and poses no toxicity risk. During application and while wet, 45% concentrated vinegar is a corrosive irritant. Keep children and pets away from treated areas until fully dry, typically one to two hours on a warm day. The salt component can cause GI upset in dogs if ingested directly from treated soil in large amounts.
5. Does it matter what type of salt I use?
Standard table salt (sodium chloride), rock salt, and non-iodized salt all work equally well. Iodized table salt is also fine. Avoid Epsom salt (magnesium sulfate) - it does not have the same osmotic or soil sterilization properties and will not improve the formula.
Key Takeaways
- How do I make weed killer with vinegar? The answer: 1 gallon of 45% concentrated vinegar + 1 cup of salt + 0.5 tsp of dish soap per quart, mixed in a sprayer and applied undiluted.
- Vinegar concentration is the single most critical variable. At 5%, the formula fails. At 45%, annual weeds die within 24 to 48 hours.
- Salt amplifies the kill and sterilizes soil. Use only on driveways, pavers, and permanent no-grow zones - not on garden soil you plan to replant.
- Apply on a hot, dry, sunny day with no rain for 24 hours. Morning application gives a full day of UV and heat.
- Nature's Freedom 45% Concentrated Vinegar is NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals and made in the USA.
- Perennial weeds require 2 to 3 repeat applications every 5 to 7 days. Annual weeds typically need only one.
