Knotweed

Knotweed (Polygonum erectum, P. aviculare) Parts used: Above ground plant and seed. Knotweed, also known as doormat grass, is considered an important kidney herb; it is a valuable diuretic and can be used to eliminate kidney stones. The genus name is derived from the Greek polys, meaning 'many', and gony, meaning 'knees', in reference to the many jointed stems of the plant. This is perhaps what led knotweed to be used as a tea remedy for swollen arthritic joints and knees. Its high silica content makes it a good remedy for strengthening the lungs' connective tissue. When knotweed stems are young and tender, between 6 to 8 inches in height, they can be collected, chopped fine and added to salads. The seeds can also be collected and used as a grain.