Vinegar as Weed Killer: What Works and What Doesn't

What Kind of Vinegar to Use

Household white vinegar (5% acetic acid) works on young annual weeds <2 weeks old, may need multiple applications. Good for weeds in sidewalk/driveway cracks—easy to target without hitting other plants. Less effective on older/perennial weeds; drenching roots in fall may help but still tough.

For tough perennials, 20% vinegar solution is best—available at garden centers/farm stores. If not in stock, ask them to order.

How to Apply Vinegar as Weed Killer

Choose a calm, dry day—wind drifts vinegar, rain dilutes it. For high concentrations, follow herbicide safety: avoid skin/eye contact, don't ingest. Unlike household vinegar, 20% can burn skin and damage eyes.

Vinegar is nonselective—harms all plants, not just weeds. Spray carefully or "paint" onto weeds with a brush. Ensure full foliage contact; acetic acid burns and dries leaves.