How to Make Weed Killer with Vinegar | Contact Burn-Down

Mixing vinegar, salt, and dish soap creates a non-selective spray that burns weed foliage on contact.

Most DIY vinegar weed killers rely on the same three ingredients: white vinegar, table salt, and a squirt of dish soap. The mixture burns and desiccates whatever foliage it touches, which makes it a solid tool for driveways, fence lines, gravel, and patios. It is not a root-killing systemic herbicide, so deep-rooted or established weeds usually need repeat sprays. The simplest recipe that works is one gallon of white vinegar, one cup of table salt, and one tablespoon of liquid dish soap, mixed until the salt fully dissolves.

What The Basic Recipe Needs

Household white vinegar (typically 5% acetic acid) works for young, tender weeds, but it struggles against established growth. For tougher jobs, horticultural vinegar at 15–45% concentration delivers faster, more reliable burn-down.

The standard home formula is simple:

• 1 gallon white vinegar (household 5%, or stronger if you have it)
• 1 cup table salt
• 1 tablespoon liquid dish soap

The dish soap helps the mixture cling to leaves instead of beading off, and the salt pulls moisture from plant tissue.

How To Mix And Apply It Right

Start by dissolving the salt in the vinegar before adding soap. If you are using a stronger vinegar or want faster dissolving, stir the salt into hot water first, then combine with the vinegar. Add the dish soap last, shake or stir thoroughly, and pour the mix into a sprayer.

Spray directly onto weed leaves and stems until they are wet, on a hot, sunny day with no rain forecast. Cool, cloudy, or rainy conditions weaken the effect significantly. Reapply every 2–3 days until the weeds die, especially after rain or for persistent growth that resprouts from roots.

If the weed regrows from its roots, which is common with dandelions or bindweed, repeat the application on the new foliage.

Where To Use It — And Where Not To

This mixture is non-selective: it damages any plant it touches, including ornamentals and garden crops. Keep it to paved areas like driveways, patios, fence lines, and gravel paths, or spot-treat with care where desirable plants are far away. Spraying onto soil itself is a mistake — the salt can linger in garden beds and injure plant roots or future plantings.

Three common failures explain most disappointing results:

• Using only table vinegar — household 5% vinegar reliably kills young weeds; established ones often need horticultural strength.
• Spraying before rain — the mixture washes off before it burns the foliage, wasting the effort.
• Expecting root kill — this is a contact treatment, not systemic; deep-rooted weeds will resprout.

Avoid overspray drifting onto lawns or flowerbeds, and wear eye protection if splashing is likely. Rinse your sprayer well afterward, especially if it previously held herbicides or other chemicals.

For persistent weeds in beds or turf, a vinegar solution alone may not be enough — and for a tested roundup of stronger vinegar-based options, see our best natural vinegar herbicide picks here.

FAQs

Does vinegar weed killer work on established weeds?

It burns down the foliage of established weeds but rarely kills deep or extensive root systems, so regrowth is common. Higher-strength horticultural vinegar (15% or more) works noticeably better than household vinegar.

Can I use any dish soap in the mixture?

Nearly any liquid dish soap works, since its job is to help the vinegar and salt stick to waxy weed leaves instead of beading off. A tablespoon per gallon is the standard measure; a few drops of a surfactant can substitute in a pinch. Avoid adding more soap than the recipe calls for, as excess suds can clog sprayer nozzles and create a mess.

Will the salt in this recipe ruin my garden soil?

Salt can build up in soil, harm plant roots, and make future planting difficult, so never spray this mixture onto garden beds or lawns. It is intended for pavement cracks, gravel, patios, and fence lines where runoff into planted areas is unlikely. For weed control near desirable plants, consider a product formulated for that job instead of a salt-based solution.