Dr. Earth Pelletized Soil Acidifier 6 lb., helps to lower the pH in soils with excessive alkaline levels. It is a great source of sulfur which promotes dark green growth and is ideal for all acid loving plants, lawns, evergreens, trees and vegetables. It is effective in helping to turn hydrangeas blue. The pelletized granule form makes it easy to handle and easier to break down in the soil. Covers 100 square feet.