Vinegar’s weed-killing properties are due to its acetic acid content. When applied to the leaves of a plant, the acid breaks down the cell membranes, causing the plant to dry out and die. This process is most effective on young, tender weeds, as mature plants may have more robust defenses.
Research has shown that vinegar with higher concentrations of acetic acid can be even more effective, but for home use, the standard 5% found in household vinegar is sufficient. It’s important to note that vinegar is non-selective, meaning it can harm any plant it comes into contact with, so careful application is necessary.
4. How Salt Enhances the Weed-Killing Effect
Salt works by drawing moisture out of the plant cells, leading to dehydration and eventual death. When combined with vinegar, the salt helps to ensure that the plant cannot recover from the initial acid damage.
However, caution is advised when using salt in the garden. Excessive salt can lead to soil degradation, affecting the growth of future plants. Therefore, it’s best used in areas where you do not plan to plant anything else, such as driveways or walkways.