That claim is misleading. There is no safe home method that kills weeds in 1 day and permanently prevents regrowth forever.
Weeds can be killed quickly, but they often return because seeds and roots remain in the soil.
What actually works (and how fast)
1. Boiling water (fast, simple)
- Destroys weeds on contact within hours
- Works best on cracks in pavements/driveways
- May need repeat applications
2. Vinegar-based spray
- Burns leaves within 24 hours (especially young weeds)
- Doesn’t reliably kill deep roots
- Often regrowth happens
3. Manual removal (most effective long-term)
- Pulling weeds out with roots
- Works best after rain or watering when soil is soft
4. Mulching (prevention)
- Blocks sunlight so weeds don’t grow
- One of the best long-term solutions for gardens
5. Herbicides (chemical option)
- Systemic types can kill roots more effectively
- Must be used carefully according to label instructions
Important reality check
- “Never grow again” is not realistic
- Even strong herbicides cannot permanently stop all future weeds
- New seeds can always enter soil
Bottom line
Weeds can be controlled and reduced, but no single ingredient or trick permanently eliminates them in 1 day.
If you want, tell me where the weeds are (garden, lawn, tiles, driveway), and I can suggest the best method for that exact situation.
