I purchased the Weed Dragon with the intent to control grass & weeds that sprout in the crevices between bricks in a brick driveway (~12 feet by 80 feet), a brick patio (about 20 feet by 25 feet) and a connecting path (about 6 feet by 30 feet). All of this brick is laid without mortar on a stone and stone dust base that is 8 to 10 inches deep so that it serves as a pervious surface for water runoff control. Grass and weed seeds find their way into the cracks and must be eliminated. I do not want to use any chemical including salt that will pass into the soil. The Weed Dragon has proved very effective. It took a couple of times for me to learn that I do not need to burn the plants to a crisp to kill them. This is an important point as it saves fuel if the flame is only applied to each plant long enough to cause a good wilt. The Weed Dragon is effective for my purpose. I do not know of any other way to control these grasses and weeds that does not place undesirable chemicals into my soil.