Weed mat is generally made of plastic or cloth. It works by stopping the supply of sunlight to the weeds, thereby killing them. A high quality weed mat will suppress the growth of weeds, while at the same time providing sufficient drainage for the soil underneath, so that it stays moist and nourished. Weeds compete with the plant for nutrition and affect the plant growth negatively. Your plant will never reach its potential with the growth of weeds.As you can see, Weed mat can be used in both open fields and greenhouses to prevent weed growth, reduce herbicide usage, and conserve water.They can be used for soilless cultivation or cultivation with soil.Combined with Weed mat Nails, the mat can stay in the ground for MANY YEARS