... under the above environment. [Introduction for Giant kontweed]Giant knotweed is an East Asian species (polygonum cuspidatum ... , anti-virus, prevent the cardiovascular diseases, etc.Giant knotweed extract has exhibited antitussive, antihistaminic, hypotensive, vasodilating, ... cytotoxic, and antioxidant properties, among others. Giant knotweed extract is also a concentrated source of resveratrol, ...