Weed seeds are in all soils, just like a garden. Because of the optimum growing conditions used in hydroseeding, weed seeds will try to germinate. Do not be concerned when they appear. As the grass starts to establish, many weeds cannot survive as the grass roots will take over. Proper maintenance of your lawn such as mowing and fertilizing will control weeds. Do NOT apply a weed and feed or any kind of herbicide to the newly germinated lawn. Only after your 4th mowing, may an herbicide be used.