There is another plant in Baiyangdian Lake: reed. Reed is a tall grass that has been aquatic or wet for many years. It grows beside irrigation ditches, river banks and swamps. , growing all over the world. The leaves, flowers, stems, roots and asparagus of reed can all be used as medicine. The stems and roots of reed can also be used in paper industry and biological agents. Processed reed stalks can also be made into handicrafts. In ancient times, the ancients used reeds as brooms. Reed is one of the main plants growing in wetland environment. Most of them grow in shallow water areas such as ponds, river banks and streams, and often form reed ponds. Yu Yafei's poem said: "In shallow water, there are graceful reeds in wetlands;" There are many postures swaying in the wind, which are unpretentious. "Reed stems are erect, plants are tall, swaying in the wind, and wild interests are everywhere. Reed plays an important role in purifying sewage, because its leaves, leaf sheaths, stems, rhizomes and adventitious roots all have aeration tissues. Reed stems are tough and high in fiber content, which is a rare raw material for paper industry.