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Knotweed is an annual plant, growing up to 2 meters in height. It has a woody, branched root and much branched stems, varying in size. When it grows on a suitable soil and clear of other vegetation, the stems are prostrate with large leaves; when it grows crowded by other plants, stems are upright and the leaves are smaller. Leaves are arranged alternately, lanceolate or oval, and usually stalkless. Tiny flowers are formed in clusters of two to three, in the axils of the stem. They vary in color: pink, red, green, or pale white. The plant is in flower from May to October.
Resveratrol contained in Japanese knotweed can also have preventative effects against some forms of cancer. According to the Linus Pauling Institute at Oregon State University, resveratrol has proven to have preventative properties against many forms of cancer, such as breast, prostate, colon, pancreatic and thyroid. The data was obtained by inducing human cells with chemical carcinogens. Resveratrol was not proven effective against lung cancer induced by the carcinogens in cigarette smoke.
Reference: http://bit.ly/1OH1RAc
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