Espoma® Organic Soil Acidifier 6lb Bag
This all natural and organic plant supplement will lower the pH of soils and help acid loving plants achieve their optimum growth. It is also used to turn hydrangeas from pink to blue and is a great choice for blueberries. This formula is long lasting, effective, non-toxic and is safer to use than aluminum sulfate. It is derived from elemental Sulfur and Gypsum and is pelletized for ease of application.