Helps create an acid soil condition for plants. Intensifies blue color in hydrangeas. Use on azaleas, gardenias, camellias, rhododendrons, blueberries and others listed on label. Application rates: ? Shrubs: 1 lb. Per 3 ft. Of height ? Trees: 1 lb. Per inch of diameter ? To correct alkaline soil: 5 lbs. Per 100 sq. Ft.