Oats (Avena) belong to the sweet grass family (Poaceae). Oats are used as food and feed. In the past, oats were considered a weed for a long time. It is a plant with net-like roots. Avena is a genus of Eurasian and African plants in the grass family. The species known as oats have been cultivated for thousands of years and are widespread throughout Europe, Asia and Northwest Africa. All oats have edible seeds, but in most species they are small and difficult to harvest.