The diameter of the cone of "burning" is really small to large areas. It is rather a "booster" system and "punctual" weeding. Maybe is it a "coup" to take, but it works on some herbs, other regrowth is fast and the grass even seems to emerge stronger roots level ... Chemical weed killers will soon be banned, I thought here find a solution, but it will take more effective systems if you want to go totally chemical ...