Boiling water makes an excellent weed killer, especially for those difficult areas that are beyond the reach of mechanical weeders.
Simply boil water in your teapot or other pot and pour.
Boiling water is the ultimate organic solution: the heat kills the weeds, but leaves no residue.
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Other articles of interest:
Make a Sprinkler, Spray Gun or Garden Watering Wand from a Plastic Bottle
The GardenZeus Guide to Watering Tomatoes