One of my major projects at the PMC is gathering and cleaning seeds for the National Park Service and the BLM. Here I am putting seeds from Nassella pulchra (Purple Needle Grass, and let me tell you its seeds are every bit as sharp as a needle! they can go right through leather gloves!!!) through a Hammer Mill to remove the awns before we used another machine that uses blowing air and different size screens to sort the good seed from the bad and the chaff.