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The problem is that the timing and conditions have to be just right for the corn gluten meal to work as a weed suppressor. It must be applied just before the weed seeds germinate. It will not kill any weed seedlings that have already established a root system. In fact, it actually enhances the growth of these older weed seedlings by providing the nitrogen that they need to flourish!
As far as using corn gluten meal in a flower bed, this will not harm established plants or bulbs or keep them from blooming. Do not use it in a flower bed where you are planing to plant flower seeds as the corn gluten meal will prevent the growth of the flower seedlings. Keep in mind that corn gluten meal will not kill weeds that have already grown - you must first get rid of those weeds. Once the bed is clean of weeds, put down the corn gluten meal according to the label directions to prevent new weeds from becoming established.