The general definition of nepps 'hopelessly entangled masses of fibers'. Nepps appear naturally in some spun yarns and is more common in certain types of fibers. However, there are two distinguishable types of nepps. Those with plant matter or 'seeds' wrapped in fiber and those of just tangled and slightly felted fiber. These nepps are free of seeds although some vegetable matter may appear. A vast majority of nepps are caused by handling and processing. Almost any mechanical process can cause the formation of nepps, but the most likely ones include harvesting, ginning, and opening/cleaning in the textile mill.
Nepps are generally removed and discarded, however they are perfect for use in creating texture in batts and felted pieces. Or dyed and spun into your yarns to create a fun texture and a truly unique creation.