This mixture combines three common household items, each playing a distinct role in killing weeds.

White vinegar (5%+ acetic acid): Acts as the primary desiccant. Acetic acid strips moisture from plant tissues, causing leaves to wilt and die on contact.

Salt (sodium chloride): Enhances desiccation and disrupts plant water uptake through osmosis. Warning: it can linger in soil and inhibit future growth.

Dish soap: Functions as a surfactant, reducing surface tension so the mixture clings to waxy weed leaves instead of beading and rolling off.

Research note: Studies published in Weed Technology show that horticultural vinegar (20% acetic acid) is significantly more effective on tough weeds than household vinegar (5%). Household vinegar works best on young, annual weeds under sunny, dry conditions.

What This Mixture Can and Cannot Do

What it CAN do:

Kill young, annual weeds like chickweed, crabgrass seedlings, and purslane

Work quickly on foliage, with wilting often visible within hours

Break down relatively quickly in the environment (vinegar degrades; salt may linger)

Be made with inexpensive, widely accessible ingredients

What it CANNOT do:

Reliably kill deep-rooted perennial weeds like dandelions, bindweed, or thistles

Selectively target weeds without harming nearby grass, flowers, vegetables, or trees

Prevent future weed growth (it offers no residual control)

Work well in cool, cloudy, or humid conditions (reduced absorption and drying)

Replace foundational soil health practices like mulching, proper planting, and competition

Key insight: This is a foliar desiccant—it burns the leaves it touches. It does not travel to roots or provide long-term prevention.

How to Make & Apply This Herbicide Safely

Ingredients & Equipment:

2 cups white vinegar (minimum 5% acetic acid)

½ cup fine or coarse table salt

1 tablespoon basic dish soap (avoid moisturizing, antibacterial, or “gentle” formulas)

1 spray bottle or garden sprayer (dedicated solely to herbicide use)

Protective gear: gloves, eye protection, long sleeves

Step-by-Step Preparation:

In a container, combine the vinegar and salt. Stir until the salt is mostly dissolved (warming the vinegar slightly speeds this up).

Gently stir in the dish soap to avoid excessive foaming.

Transfer the mixture to your labeled spray bottle or garden sprayer.

Test first on a small, inconspicuous area to check for surface discoloration, as vinegar can etch some stone or concrete.

⚠️ Critical: This mixture is non-selective. It will damage or kill ANY plant it contacts.

Application Guidelines: