Not only is it edible; it is good for you. Japanese knotweed is an excellent source of Vitamins A and C and contains potassium, zinc, phosphorus, and manganese. It has been used for centuries in its native countries for treating many ailments, such as respiratory infections.
Knotweed is an herb. The whole flowering plant is used to make medicine.
Knotweed is used for bronchitis, cough, gum disease (gingivitis), and sore mouth and throat. It is also used for lung diseases, skin disorders, and fluid retention. Some people use it to reduce sweating associated with tuberculosis and to stop bleeding.
Gum disease (gingivitis). Developing research suggests that a root extract of knotweed might be useful as a mouth rinse to treat gingivitis. Gingivitis is caused by plaque, a film of saliva and bacteria that builds up on teeth at the gum line. The knotweed extract seems to decrease bleeding and swelling of the gums, possibly because it might interfere with the formation of plaque.
- Lung diseases
- Skin diseases
- Fluid retention
- Decreasing sweating associated with tuberculosis
- Stopping bleeding