If you’re looking for an alternative to synthetic herbicides, horticultural vinegar can be an effective option for controlling young weeds. Unlike household vinegar, which contains about 5% acetic acid, horticultural vinegar typically contains 20% or more. This higher concentration makes it much more effective at burning the leaves and stems of small, actively growing weeds.
Many gardeners combine horticultural vinegar with a small amount of liquid dish soap. The soap acts as a surfactant, helping the vinegar spread evenly across the leaf surface and improving contact with the weed. This mixture works best on sunny, dry days when temperatures are warm, allowing the vinegar to dry quickly and maximize its effect.
Horticultural vinegar is a contact herbicide, meaning it only damages the parts of the plant it touches. It does not move into the roots, so perennial weeds with extensive root systems may regrow and require repeated treatments or removal by other methods. It is most effective on annual weeds and newly emerged seedlings.
Although horticultural vinegar is a natural product, it should never be considered harmless. The concentrated acetic acid can cause severe skin burns and permanent eye damage. Always wear chemical-resistant gloves, long sleeves, long pants, closed-toe shoes, and safety goggles or a face shield when mixing or spraying. Avoid breathing the mist and never spray on windy days where drift could damage desirable plants or expose people or pets.
Keep children and pets away until the treated area is dry. Store horticultural vinegar in its original labeled container, out of reach of children, and never transfer it to food or beverage containers.
Used carefully, horticultural vinegar can be a valuable part of an integrated weed management program. Combined with mulching, hand weeding, and proper landscape maintenance, it offers gardeners another tool for reducing unwanted weeds while minimizing the use of conventional herbicides.