Reynoutria multiflora Seeds | Polygonum Multiflorum He Shou Wu
LATIN NAME: Reynoutria multiflora
COMMON NAME: He Shou Wu, Fo-Ti
Plant Profile
Polygonum multiflorum, now placed as Reynoutria multiflora, is a twining, herbaceous perennial vine of the knotweed family, with red-stemmed shoots bearing alternate, glossy, heart-shaped leaves. In late summer it opens small white flowers in branching clusters, followed by small winged fruits, while the large, dark, tuberous root swells below as the part that matters.
As a tonic, processed fo-ti is taken to nourish the blood and the kidney, to steady the spirit and, by the old claim, to darken the hair. The tradition pairs it with other herbs in a formula, and the modern warning is blunt: watch the liver, respect the dose, and tell the clinician what you are taking, because the anthraquinones interact.
The classic use aims at the blood and the water organs, with the root decocted or powdered in a mix rather than eaten alone. The effect is slow and the dose small, and the tradition treats it as a building medicine, not a quick fix, which is the safe frame for any stilbene-rich root taken over a long spell.
Reports of liver injury tied to the raw root put a hard edge on the caution, and the advice is to source prepared material from a known grower and to avoid long, high doses. The vine is famous for a reason, but fame is not a safety sheet, and the careful user reads the label before making it a daily drink.
Run the vine up a net or a row of strings in full sun to part shade, and thin the base so air moves through the stand. Cut the top once the cane reaches the wire to push a bushier climb, and lift the root after a few seasons when the stem is woody at the base and the root has swollen.
Science & Biotechnology
The name on the seed packet has changed. What was filed for generations as Polygonum multiflorum is now moved into Reynoutria alongside Japanese knotweed, on the strength of the twining stem and the root structure. The plant did not move; the taxonomists did, and the grower simply keeps both labels in mind when sourcing stock.
The marker compound analysts track is 2,3,5,4′-tetrahydroxystilbene-2-O-beta-D-glucoside, a stilbene glucoside called TSG, joined by resveratrol and its kin. These are the molecules the trade assays for, because they sit in the prepared root and stand for the quality of the batch more than any single mineral does.
The raw root also carries anthraquinones such as emodin and physcion, the fraction that gives the laxative action and, in excess, the caution. The same compounds that purge are the ones linked to the liver and kidney worries, which is why the raw root is dosed with care and the prepared root is the form most people meet.
Uses & Benefits
The legend says a man named He, grey and childless, ate the root of this vine, grew dark hair and fathered a family, and the name fo-ti, literally Mr He’s black hair, has stuck for centuries. The story is folklore, but it points at the real use: a twining root prized in the tradition as a tonic for the blood and the hair, and the single most famous knotweed in the herb trade.
The field mark is the red, twining stem and the clean heart-shaped leaf with a pale midrib, a combination that separates it from the broader-leaved relatives it climbs with. In a thicket the red stem glows against the green, which is how a forager tells the tonic vine from the look-alikes before the root is ever dug.
The root is sold two ways, and they are not the same. The raw root, raw fo-ti, is used as a mild laxative and a coolant, while the prepared root, processed fo-ti, is the dark, steamed-and-dried tonic of the tradition. The preparation changes the chemistry enough that the two are treated as different medicines, and the buyer must know which is in the bag.
Growing from Seed
Sow in a warm spot with a trellis in place, because the plant climbs from the start and resents being moved once it has wound itself round a neighbour. The seedling wants even moisture and a rich root run, and the vine fills a fence by mid season if the support is there.
Soak the hard seed and sow it shallow in a fine mix, then prick out when the first true leaves are open and the stem stands a few centimetres tall. Give each seedling its own cane or string early, because a tangled row of red stems is a job to undo later in the season.
Our Take
Fo-ti is a vine worth growing for the root and the story, but buy prepared root from a named source and mind the liver warning. For related knotweed-family plants see the Chinese rhubarb, the buckwheat, and the Japanese knotweed.
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