Common Name:
Other Names:
Birdweed, Common Knotgrass, Low Grass, Prostrate Knotweed
Botanical Name:
Polygonum aviculare
Parts Used:
Various parts of the entire plant, frequently differing by country and culture.
Chemical Constituents:
  • Avicularin
  • Emodin
  • Quercitin 3-arabinoside
  • Known Effects:
  • Reduces capillary fragility
  • Reduces capillary permeability
  • Retards destruction of epinephrine
  • Possible Additional Effects:
  • May cause watery, explosive bowel movements
  • May treat kidney and bladder stones
  • Warnings and Precautions:
    Don't take if you:
  • Are pregnant, think you may be pregnant, or plan pregnancy in the near future.
  • Have any chronic disease of the gastrointestinal tract, such as stomach or duodenal ulcers, reflux esophagitis, ulcerative colitis, spastic colitis, diverticulosis, or diverticulitis.

  • Consult your doctor if you:
  • Take this herbs for any medical problem that doesn't improve in 2 weeks (There may be safer, more effective treatments.)
  • Take any medicinal drugs or herbs including aspirin, laxatives, cough and cold remedies, antacids, vitamins, minerals, amino acids, supplements, other prescription or non-prescription drugs.

  • Pregnancy:
    Don't use unless prescribed by doctor.
    Don't use unless prescribed by your doctor.
    Infants and Children:
    Treating infants and children with any herbal preparation is hazardous.
    None are expected if you are beyond childhood, under 45, not pregnant, basically healthy, take it only for a short time and do not exceed manufacturer's recommended dose.
  • Store in cool, dry area away from direct light, but don't freeze.
  • Store safely out of reach of children.
  • Don't store in bathroom medicine cabinet. Heat and moisture may change the action of the herb.

  • Safe Dosage:
    Consult your doctor for the appropriate dose for your condition.
    Rated relatively safe when taken in appropriate quantities for short periods of time.
    Adverse Reactions, Side Effects, or Overdose Symptoms:
    Signs and Symptoms What to Do

    Abdominal pain Discontinue. Call doctor when convenient.
    Diarrhea Discontinue. Call doctor immediately.
    Nausea or Vomiting Discontinue. Call doctor immediately.
    Skin Eruptions Discontinue. Call doctor when convenient>
    Vitamins, Herbs, Minerals, & Supplements The Complete Guide by H. Winter Griffith, MD Copyright©1998 Fisher Books pp.423-424