Pine Bark Aged Fines can be used as a soil amendment or as a mulch. This product consists of the very small pieces of pine bark that are removed during the screening process of aged pine bark nuggets. Because pine fines have such a fine texture they make excellent mulch for flowerbeds. As a soil amendment pine fines improve drainage, add organic matter, and help to maintain an acidic soil as they have a low pH, which is great for acid-loving plants.  
Pine fines are what Va Tech recommends for breaking up our clay soils.