Overview
- Garden-centre advice and a viral TikTok clip promote pouring boiling water on patio weeds, with claims of root kill in about 24 hours.
- Weedingtech says weeds only die reliably in a heat ‘kill zone’ above 57°C, with the best results when about 80°C is held for the first five seconds.
- The firm adds that kettle water cools fast on contact with air and stone, so it often wilts leaves without reaching roots and may need repeat treatments.
- Home gardeners report mixed results, from quick browning on small weeds to regrowth on tougher patches that need more pours.
- Some DIY posts add salt or vinegar, but specialists warn salt can leave soil barren and runoff can harm nearby plants and lawns.