Vinegar is an effective household cleaning solution for windows, counter tops, cutting boards and much more. But how about as a weed killer?
Acetic acid, also known as vinegar, is used in products for weed control. Many people choose it because it is natural. However, acetic acid can damage skin and eyes, especially at concentrations commonly found in weed killers.
Household vinegar such as distilled white vinegar used for cleaning or cooking generally contains 4-6% acetic acid, which is diluted in water. Horticultural vinegar used to kill weeds is typically a concentrated solution of 20% or more acetic acid. You may find even higher concentrations of acetic acid sold in stores or online.
Acetic acid is a non-selective contact herbicide meaning it must touch the foliage of the plant in order to work. It doesn’t travel throughout the plant; rather it breaks open cell walls and causes plants to die by drying out. It breaks down rapidly in the environment and doesn’t leave a residue.
Products registered to be used as herbicides have high concentrations of acetic acid, typically 20% or more and will have a signal word of DANGER because of the high concentrations and high toxicity. Acetic acid is irritating to the eyes and skin. At concentrations above those usually found in household vinegar, it can be extremely irritating or corrosive. Acetic acid can permanently damage the corneas if it gets into your eyes. It can burn skin and the tissues of your mouth and throat if you accidentally swallow it. People have had irritation in their nose, throat, and in their lungs if they breathed in enough of the vapor.
Here’s some information comparing acetic acid efficacy to glyphosate.
Better yet, consider integrated pest management strategies that do not use chemicals to control weeds.