Espoma GSUL6 Soil Acidifier, 6-Pound This soil acidifier is an all natural and high purity mineral Can be used both as a plant food and as a soil amendment Lowers the pH of soils and allows acid loving plants to achieve optimum growth Long lasting and highly effective Comes in 6-pound bag This soil acidifier is an all natural and high purity mineral Lowers the pH of soils and allows acid loving plants to achieve optimum growth Long lasting and highly effective Comes in 6-pound bag