I use a propane torch with a Red Dragon wand to keep the weeds off the
decomposed granite in 5-6 places that have these paths.
http://www.flameengineering.com/
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Celestial Habitats by J. Kolenovsky
2003 Honorable Mention Award, Keep Houston Beautiful
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http://www.celestialhabitats.com - business
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http://www.hal-pc.org/~garden/personal.html - personal