New for 2007 : Finally ! An organic food grade acid, all natural, nontoxic, biodegradable, nonselective weed and grass killer that will not hurt the environment! University experiments show 20% Acetic Acid is as effective as chemical herbicides in killing annual and broadleaf weeds and weedy grasses with one application, (perennial weeds may require a second application) and weeds cannot build a resistance to the product as the acetic acid strips the leaves of their waxy coating preventing the collection of moisture and light. You will see results in a just a few hours.