From The Telegraph:
Robert Gailey, 79, watched in horror as sparks from a gas-powered garden tool caused the lawn and shrubs of his neighbours, Stuart and Phyliss McLean, to catch light. Read more.
Ouch:
I’ve got a flame-weeder that I use very sparingly and gingerly. If you use one, all I can say is be very, very careful — especially around mulch and dead plant material.
The best — or rather safest — time to flame weed is during dead calm when there’s a heavy dew or soon after rain while vegetation is wet. The object is not to set the weeds on fire. It’s just to heat them enough to boil the water in their cells, bursting them. The plants turn a darker, perhaps bluer color. The tissue shouldn’t look charred when you’re done.
Anyone who flame-weeds should keep this story — and that image — in mind when they do.