Garden Valley Naturals Hydro-Base Potting Soil is designed as a highly draining professional potting soil for hydroponics style growing conditions or in container growing needing high drainage. It consists of pumice and perlite for high porosity in addition to an all-natural blend of sphagnum peat moss, coconut coir, compost and limestone for pH adjustment. Hydro-Base can also be used for Green Roof gardening with a wide selection of native plants and sedums. Add your own unique blend of nutrients during each stage of growing. Made in Eugene, Oregon.