SunGro Horticulture SUGRBG16QT 16-Quart Black Gold All Organic Soil for Plants Sungro horticulture black gold natural and organic Includes compost and forest humus Perlite and pumice are added to ensure optimum aeration for sturdy growth This product weighs 16-pound 100 percent organic base consists of screened earthworm castings and canadian sphagnum peat moss