YES, flame weeding will kill the roots too! Even on big weeds (over 6″), you will see a stunting effect and even a kill within a few days, depending on how established the root system is and how long the plant was exposed to heat. … Fire does not know the difference between desirable flowers and undesirable weeds.

Does burning weeds stop them growing back?

While lopping off the head of a weed often fails to kill it, burning it has a different effect. If the roots aren’t entirely destroyed by the heat itself, they are usually prevented from regenerating after partial burning.

What kills weeds for a long time?

A solution of vinegar, salt and dish soap can be a cheap and effective tool against weeds. A solution of vinegar, salt and dish soap can be a cheap and effective tool against weeds. Pulling weeds by hand is always the most reliable solution, but I accept that there are times when herbicides may be the practical choice.