Reference
Does Vinegar Kill Weeds?
The short answer
Vinegar is a contact, non-selective herbicide: the acetic acid breaks open the plant cells it touches, so it can burn back small, young weeds — but it doesn't move through the plant to the roots, which is why perennials and established weeds usually regrow. Household vinegar (about 5% acetic acid) works only on tender seedlings.
Higher-strength horticultural vinegar (20% or more acetic acid) is more effective, but it is an EPA-registered herbicide, not a harmless kitchen product. Because of the concentrated acid, these products carry a DANGER signal word — acetic acid at that strength can permanently damage the cornea if it gets in your eyes and can burn skin — so wear eye protection and gloves and follow the label. Even then, it's mostly top-kill, not root-kill.
Top-kill, not root-kill
Acetic acid is a non-selective contact herbicide — it kills the tissue it lands on and does not travel through the plant. It won't reach the roots, so deep-rooted perennials typically resprout.
Household vinegar at roughly 5% acetic acid can knock back very small, young annual weeds on a hot day, but expect regrowth from anything established.
Horticultural vinegar is a regulated herbicide
Horticultural vinegar is concentrated to 20% or more acetic acid. Products registered as herbicides carry an EPA registration number and a signal word; the higher-strength acetic acid herbicides carry DANGER.
At these concentrations acetic acid can permanently damage the corneas if it contacts the eyes and can burn skin. NPIC's point is blunt: natural does not mean safe. Wear eye protection, gloves, and protective clothing, and follow all label directions.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- National Pesticide Information Center (Oregon State University) — Can I use vinegar to control weeds? — Household vinegar is ~4–6% acetic acid, horticultural ~20%+; acetic acid is a non-selective contact herbicide that doesn't travel to roots; 20%+ products carry DANGER signal word; can permanently damage corneas and burn skin.
- University of Maryland Extension — Vinegar: An Alternative to Glyphosate? — Vinegar provides top-kill of foliage but not root control; higher-concentration horticultural vinegar is more hazardous and requires protective equipment.