No, Terry, it just inhibits the formation of support roots for seeds, so that when seeds germinate, they quickly die. Corn gluten meal does have NPK, in a ratio of about 8-4-3, IIRC. Margaret L >I just bought 4 bags of Whitney Farm's "Uncle Malcolm's Weed Whoppin' Mulch" >which includes corn gluten as one of its ingredients. My plan is to use >this mulch on a rose & perennial bed that we began planting last fall. >Currently, the bed contains roses and Blue and Rose Queen Salvia. I am >about to plant clematis, hardy geraniums and some daffodils that didn't get >planted last fall as well as some pansies, for instant color, in the bed >before I mulch. > >My question is: does corn gluten present a problem for perennials and bulbs >that died back to the ground in the winter? In other words, will it >inhibit/kill the new growth next spring or restrict the spread of new growth >for the more mat like hardy geraniums? > >Terry