Image Noxall Weed + Grass Killer Granules kills weeds and grasses down to the root and prevents regrowth for up to one year. Use this product in locations where no plant growth is desired. This unique granular formula is ideal for use on gravel walks, along fences, around buildings, and under decks. This product is nonselective in action and may destroy all types of vegetation. Apply only to areas where complete weed and grass control is desired. Apply this product from late fall through early spring. Applications in the Northeast and upper Midwest should be made in early spring after the ground has thawed.