Weed Mat is generally made of plastic. It works by stopping the supply of sunlight to the weeds, thereby killing them. A 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. Strong and durable and easy to install yourself, IRIS Weed-matcomesina range of pre-packed sizes for your convenience. Allow the water and airflow for healthy soil and plants. It inhibits weeds’ growth and greatly reduces the need for harmful sprays.