Reed root Phragmites communis can replace Phragmites communis water, Phragmites communis, also known as Phragmites communis, Phragmites communis, Phragmites communis and Phragmites communis, and is born in rivers, lakes, ponds, ditches and low wetlands. Both reed rhizome and cogongrass rhizome can clear away heat and diuresis, clear the heat of lung and stomach, and treat heat stranguria. The tender stem (reed stem) of reed can be used instead of reed root.