Eden Apothecary · Herb Profile
Persicaria bistorta
Pronounced Bistort = BISS-tort. Persicaria bistorta = per-sih-KAIR-ee-uh biss-TOR-tuh (older name Polygonum bistorta = poh-LIG-oh-num biss-TOR-tuh). Chinese Quan Shen = chwahn shen.
Cool, dry, and powerfully astringent: a styptic snakeroot that tightens boggy, leaking, over-relaxed tissue, seals raw ulcerated surfaces, and stanches passive bleeding and hot, damp flux.
Insufficient data; avoid. Modern consumer references state there is not enough reliable information to know whether bistort is safe in pregnancy and advise avoiding it. There are no controlled human data, and a strongly astringent, tannin-rich root has not been evaluated in pregnancy, so internal use should be avoided; brief topical use as a mouth rinse or wash is a lesser concern but is also unstudied. Sources: WebMD and RxList (Bistort, pregnancy: not enough known, avoid); AHPA Botanical Safety Handbook exact class for Persicaria bistorta not located (see flags).
Insufficient data; avoid internal use. Modern references find not enough information to establish safety during breast-feeding and advise staying on the safe side by avoiding it. High tannin intake can also reduce iron absorption in mother and, theoretically, alter the milk, so a better-documented remedy is preferred; short topical use is a lesser concern but unstudied. Sources: WebMD and RxList (Bistort, breast-feeding: not enough known, avoid).
Not established for internal use. There are no formal pediatric safety or dosing data. A dilute decoction has a long folk history as a gargle or mouth rinse for children's sore or ulcerated mouths and throats and as an external wash, and such brief topical use is generally low risk, but internal use for diarrhea should be practitioner-guided and kept to short courses, with attention to hydration in a child with diarrhea. Sources: precautionary practice; WebMD / RxList (no pediatric data).
Very high tannin (up to about 21 percent): large or prolonged doses can cause nausea, gastric irritation, and constipation, and long-term heavy tannin intake is inadvisable. The root and leaves contain oxalic acid and calcium oxalate (about 1 percent in the root), so those prone to kidney stones, gout, rheumatism, or hyperacidity should be cautious with large or culinary quantities. Some members of the knotweed genus can cause photosensitivity in susceptible people. Because the tannins bind minerals and alkaloids in the gut, separate bistort from oral medications and iron supplements by at least an hour. Constitutionally a cold, drying herb: it aggravates dryness, cold, and depletion and can bind a dry bowel. In Chinese terms, avoid in cold, deficiency diarrhea without Damp-Heat. Reserve internal use for short courses.
Pregnancy and lactation (insufficient data; avoid internal use). Chronic constipation or a dry, atonic bowel (the astringent tannin worsens it). Iron-deficiency anemia and concurrent oral iron (tannins impair iron absorption; separate dosing). Cold, deficiency-type diarrhea without heat, and cold, hypofunctional (Spleen or Kidney Yang deficient) constitutions. Caution in oxalate kidney-stone formers, gout, and hyperacidity with large or culinary root and leaf doses. Not a substitute for diagnosis of serious or persistent bleeding.
Not on the United Plant Savers At-Risk or To-Watch lists, which track North American native medicinals. Persicaria bistorta is a common, widely distributed perennial of European and Asian meadows and is also grown ornamentally in gardens (including the cultivar Superba), and the North American Bistorta bistortoides is a common, non-threatened alpine and subalpine native. The chief sustainability caution is that harvesting the medicine means digging the rhizome, which kills the plant, so prefer cultivated or garden-grown stock, avoid stripping wild alpine or meadow stands, and, if wildcrafting, take only from abundant populations and replant crowns where possible.
Not named in the canonical biblical texts. Bistort is a plant of the cool meadows and mountains of Europe and northern and western Asia (with a close North American relative, Bistorta bistortoides, American bistort), and its documented medicine belongs to the European herbal tradition and to Chinese medicine (as Quan Shen), not to the ancient Mediterranean or scriptural world. Its clearest quasi-liturgical association is folk-Christian rather than biblical: as Easter-ledge or Passion Dock, its young spring leaves were gathered for a bitter herb pudding eaten during Lent and Passiontide in northern England, a custom sometimes linked to the bitter herbs of the Passover season. It is described in the early-modern European herbals of Gerard and Culpeper (as Bistort or Snakeweed) as a strong astringent that stays fluxes and bleeding and resists poison.
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