4,Helps retain soil moisture by reducing evaporation. Sun and wind are significant contributors to evaporation, which can leave the soil dry, so using a landscape fabric over the top of the soil will help keep valuable moisture in the ground.
5,Offers some erosion control on slopes subject to washout from heavy rains. Semi-permeable types of landscape fabric will allow some moisture to seep through but protect the surface of the soil from water that’s running down a slope, which can cause erosion.