It sounds like you’re referring to a weed-killer claim (possibly a headline or product slogan). Be careful with statements like “burns weeds in 1 day” and “they never grow again”—they’re usually marketing exaggerations.
- Some fast-acting herbicides can visibly damage or brown weeds within hours to a day, especially contact herbicides.
- No weed killer can guarantee weeds will never return in normal outdoor conditions, because new seeds can blow in, roots can survive, and soil conditions can favor regrowth.
- “Burning” weeds may also mean the leaves are scorched while the roots remain alive, so the plant can come back.
If you’re asking about a specific product or want a long-lasting weed-control method, share the name or a photo of the label and I can help evaluate it.
