Retards weed growth with a barrier between mulch and soil. It allows water, air, herbicides, fertilizer and insecticide to flow into the soil. It also lends insulation to root systems against sudden temperature changes and minimizes erosion and loss of mulch due to soil intrusion. This fabric is chemically inert; resists mildew, rotting and insect invasion. Reduces plant bed maintenance and cuts back the need for watering. Maintains moisture better.