If you’re asking about a product or claim that “burns weeds in 1 day and they never grow again,” be careful: most weed killers do not permanently stop weeds from returning. Many products kill the visible plant quickly, but new weeds can grow from seeds already in the soil or from remaining roots.
A few general points:
- Contact herbicides can make leaves look dead within hours to days, but they often don’t kill deep roots.
- Systemic herbicides move through the plant and may take longer but can kill roots more effectively.
- “Never grows again” claims are usually marketing language and depend heavily on the weed species, soil, weather, and how the product is used.
- Some long-lasting soil sterilants can prevent plant growth for extended periods, but they can also damage desirable plants and may not be appropriate for many yards or gardens.
If you mean a specific product, send the name, label photo, or ingredients, and I can help check what it actually does.
