09/05/2026
The Ingredients in DIY W**dkillers
If you would not want it near your own skin, it is worth asking whether it belongs near your garden soil. Soil is not inert; it is a living system that needs air, water, microbes, and structure to keep plants healthy. Here is a closer look at a few ingredients commonly recommended in homemade w**dkiller recipes.
Vinegar is acetic acid (CH₃COOH): Household vinegar is usually about 5% acetic acid, while horticultural or industrial-strength vinegar can be much stronger. When used in gardens rather than a vinaigrette, acetic acid acts mainly as a contact herbicide. It damages the plant’s protective waxy cuticle, causing exposed leaves to dry out and wither. It does not reliably move down into the roots, so deep-rooted w**ds such as dandelions will probably regrow after the top growth is burned off.
Table salt is sodium chloride (NaCl): Table salt dries out plants by drawing moisture from their cells. Unlike vinegar, it can stay in the soil for a long time and may spread to surrounding areas through water, potentially affecting nearby plants and waterways.
In ancient times, “salting the earth” was a symbolic curse to ensure land remained barren & unlivable. The clearest early written record is in the Book of Judges (9:45), which describes the Israelite leader Abimelech capturing the city of Shechem, killing its people, tearing it down, & sowing the land with salt.
Rubbing Alcohol is Isopropyl Alcohol / Ethanol (C₃H₈O / C₂H₆O): Dry and damage plant tissue while potentially affecting beneficial soil microbes.
Detergents: Homemade mixtures stick to leaves, but do not make them safer for soil, insects, or nearby plants.
Other ingredients in DIY w**dkiller recipes include:
Epsom salt (MgSO₄·7H₂O): A component of some fertilisers, meaning you may be feeding the w**ds.
Baking soda (NaHCO₃): Can alter soil pH when overused.
Bleach (NaOCl): May kill w**ds but can also harm soil life, nearby plants, and beneficial insects.
Hydrogen peroxide (H₂O₂): Can scorch w**ds but may also damage beneficial microbes and sensitive roots.
**dkiller
