One important part to a successful growing season is a quality pre emergent barrier against weeds. As soil temperatures rise weeds in your lawn are trying to germinate. As the seed develops this pre emergent barrier will not allow roots to mature thus starving the plant of the nutrients it needs to break the surface of the soil. To be an effective pre emergent the product must be applied at least two weeks prior to germination. At Mathis Outdoors we are currently applying pre emergent from now until the end of spring.