Information on Knotweed

Latin NamePolygonum aviculare
Other NamesKnotgrass
Part UsedRoot
Herb FormsBulk herb, tincture.
AffectsDigestive system, Urinary system, Cardiovascular system
CautionsAvoid use of this herb if you have a deficiency condition, such as deficiency of hormones and metabolic substances (Kidney Yin deficiency in Chinese medicine).
Botanical InfoA low-growing inconspicuous annual weedy plant in the Buckwheat family with opposite leaves.
DescriptionThis wild plant contains tannins and is used as an astringent for diarrhea and hemorrhage. It is mildly diuretic and is indicated for urinary gravel or stones, kidney or bladder infections, and painful urination. In Chinese medicine knotweed is employed as a diuretic, to regulate urination, and expel worms.

Knotweed has a taste of BITTER, ASTRINGENT and a temperature of COLD.


Decoction1 cup 2-3 x daily
Tincture2-3 droppersful 2-3 x daily

Ailments Treated by Knotweed

AilmentTreatment SupportApplication
Diarrheaastringenttea, tincture
Gravelmild diuretictea, tincture
Kidney, infectiondiuretictea, tincture


Bensky, D. and A. Gamble. 1986. Chinese Herbal Medicine. Seattle: Eastland Press.
Weiss, R. 1988. Herbal Medicine. Beaconsfield, England: Beaconsfield Publishers.
Wren, R.C. 1988. Potter's New Cyclopaedia of Botanical Drugs. Essex: C.W. Daniel Co. Ltd.