Polygonum cuspidatum

Japanese Knotweed

Polygonum cuspidatum

Japanese Knotweed

This plant is native to Eastern Japan, China and Korea. In the United States it is considered an invasive species as it is in most other countries. It is considered one of the worst invasive species in the world. The plant grows rapidly and displaces native species quickly with its large size and is difficult to eradicate due to the way it is able to propagate through its root system. Luckily the plant has some redeeming qualities, which should make it very desirable to harvest. It is known as a rich source of the antioxidant Resveratrol.

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Traditional Health Benefits of Japanese Knotweed

Heart Support, Immune Support

What is Japanese Knotweed Used for?

In addition to the popular antioxidant Resveratrol, Japanese Knotweed also contains a chemical known as emodin. Emodin has the ability to regulate bowel motility among other things. The Japanese used an alcohol extract of this plant as a natural laxative. Modern preparations from Japanese Knotweed are concentrated to maximize the Resveratrol and contain very little emodin. The phytochemical Resveratrol has garnered considerable scientific attention for its potential to support healthy blood vessel function and promote heart health. A recent search for studies on Resveratrol through the national library of medicines database; PubMed, yielded over two thousand results.

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Active Constituents of Japanese Knotweed


Parts Used


Additional Resources

Important Precautions

Not for use during pregnancy or lactation. If you have a medical condition or take pharmaceutical drugs please consult your doctor prior to use.


This information in our Herbal Reference Guide is intended only as a general reference for further exploration, and is not a replacement for professional health advice. This content does not provide dosage information, format recommendations, toxicity levels, or possible interactions with prescription drugs. Accordingly, this information should be used only under the direct supervision of a qualified health practitioner such as a naturopathic physician.

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