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Knotgrass, scientifically known as Polygonum Aviculare and commonly referred to as Bian Xu in Traditional Chinese Medicine (TCM), is a herbal remedy with a rich history of use. This herb has various therapeutic properties, making it a valuable addition to the TCM pharmacopeia. Knotgrass is primarily known for its ability to alleviate urinary and skin issues, thanks to its dampness-draining properties.

Knotgrass (Bian Xu) in Traditional Chinese Medicine

In TCM, Knotgrass falls under the "Drain Dampness" chapter and section, making it an effective remedy for symptoms associated with dampness and heat, particularly in the urinary bladder. Due to its slightly cold nature and bitter taste, Knotgrass is believed to have a cooling and purifying effect on the body.

Treatment Principles

Knotgrass addresses various health issues by following these primary treatment principles:

  1. Clear Damp Heat: Knotgrass effectively clears damp heat in the urinary bladder, which is often the underlying cause of urinary tract infections, inflammation, and discomfort.
  2. Promote Urination: By promoting urination, Knotgrass helps flush out toxins and waste products, relieving symptoms such as painful or difficult urination.
  3. Unblock Painful Urinary Dribbling: Knotgrass can help alleviate painful urinary dribbling and improve overall urinary function.
  4. Expel Parasites: This herb is known to combat parasitic infections, particularly those affecting the gastrointestinal tract.
  5. Stop Itching: Knotgrass possesses anti-inflammatory and antipruritic properties that help soothe irritated and itchy skin.

Administration and Usage

Knotgrass is commonly administered as a liquid herbal glycerite. To use this preparation, shake the bottle well before each use, and follow the recommended dosage of 20-30 drops three times a day or as directed by your practitioner. It is best to dilute the glycerite in a glass of water, tea, or juice before consumption. Alternatively, glycerites can be taken directly by mouth, although some may find the taste unpalatable.

Precautions and Contraindications

Knotgrass is generally considered safe, with no listed contraindications. However, it is always advisable to consult a healthcare practitioner before incorporating any new herbal remedy into your regimen, especially if you are pregnant, nursing, or taking medications.


Knotgrass (Bian Xu) is a versatile and valuable herb in Traditional Chinese Medicine. Its dampness-draining properties make it an effective remedy for urinary and skin issues, providing relief from inflammation, itching, and discomfort. As with any herbal remedy, consult a healthcare practitioner before use to ensure Knotgrass is suitable for your individual needs.

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