Acid Mix Potting Soil is specially formulated for moisture loving plants and plants that prefer acid conditions. This potting soil is a mixture of peat moss for moisture retention and pumice for aeration and root health. It is great for use with azaleas, rhododendrons, camellias, hydrangeas, evergreens, blueberries, raspberries, strawberries, and all other acid loving plants. Ingredients: peat moss and pumice (pH 5.5).