Bleach may be used to kill weeds, though the Colorado State University Extension Service cautions that it will raise the soil pH and add sodium to the soil. If the roots survive, the weed may come back. Perennial weeds and those with extensive root systems are especially likely to return.
About this Author
Marie Notnats enjoys learning about new topics and teaching people new skills. She has been writing professionally since 2008. She is a professional horticulturist with a Bachelor of Science degree in horticulture from Brigham Young University. She writes for About.com, Examiner.com, eHow, and assorted gardening blogs.