The small pieces of Pine Bark are called Fir Bark Fines, or Pine Bark Fines. But don't worry- These aren't like the ones you get for not paying the meter; these are the good ones! Also sometimes called Orchid Bark, this serves the purpose of creating pockets of air in the soil of your plants, and thereby allowing for better drainage. This can easily be the difference between life and death for us over-waterers! Used in our chunky Aroid Blend, along with Coarse Perlite or Pumice, Charcoal, and Coir Pith, this is a great additive to aerate your plant's root zone!