Botanical Name: Polyganum aviculare
Species: P. aviculare
Synonyms: Knotgrass. Centinode. Ninety-knot. Nine-joints. Allseed. Bird’s Tongue. Sparrow Tongue. Red Robin. Armstrong. Cowgrass. Hogweed. Pigweed. Pigrush. Swynel Grass. Swine’s Grass.
Common Names : Knotweed, Prostrate knotweed, Birdweed, Pigweed and lowgrass.
Part Used: Whole herb.
Habitat: Polyganum aviculare occurs throughout the world. It is mostly found in fields and wasteland.
Common knotgrass is an annual herb with a semi-erect stem that may grow to 10 to 40 cm (4 to 16 in) high. The leaves are hairless and short-stalked. They are longish-elliptical with short stalks and rounded bases; the upper ones are few and are linear and stalkless. The stipules are fused into a stem-enclosing, translucent sheath known as an ochrea that is membranous and silvery. The flowers are regular, green with white or pink margins. Each has five perianth segments, overlapping at the base, five to eight stamens and three fused carpels. The fruit is a dark brown, three-edged nut. The seeds need light to germinate which is why this plant appears in disturbed soil in locations where its seeds may have lain dormant for years. It is noted for attracting wildlife……..CLICK & SEE THE PICTURES
Succeeds in an ordinary garden soil but prefers a moisture retentive not too fertile soil in sun or part shade. Repays generous treatment, in good soils the plant will cover an area up to a metre in diameter. Prefers an acid soil. Dislikes shade. Knotweed is a common and invasive weed of cultivated ground. It is an important food plant for the caterpillars of many species of butterflies. It also produces an abundance of seeds and these are a favourite food for many species of birds. Plants seem to be immune to the predations of rabbits. The flowers have little or no scent or honey and are rarely visited by pollinating insects. Self-fertilization is the usual method of reproduction, though cross-fertilization by insects does sometimes occur. The plant also produces cleistogomous flowers – these never open and therefore are always self-fertilized. The plant is very variable and is seen by most botanists as an aggregate species of 4 very variable species, viz. – P. aviculare. L.; P. boreale. (Lange.)Small.; P. rurivacum. Jord. ex Box.; and P. arenastrum. Box.
Seed – sow spring in a cold frame. Germination is usually free and easy. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in the summer if they have reached sufficient size. If not, overwinter them in a cold frame and plant them out the following spring after the last expected frosts. Division in spring or autumn. Very easy, larger divisions can be planted out direct into their permanent positions. We have found that it is better to pot up the smaller divisions and grow them on in light shade in a cold frame until they are well established before planting them out in late spring or early summer.
Edible Uses :
Edible Parts: Leaves; Seed.
Edible Uses: Tea.
Young leaves and plants – raw or cooked. Used as a potherb, they are very rich in zinc. A nutritional analysis is available. Seed – raw or cooked. Rather small and fiddly to utilize, they can be used in all the ways that buckwheat (Fagopyrum esculentum) is used, either whole or dried and ground into a powder for use in pancakes, biscuits and piñole. The leaves are a tea substitute
Chemical Compositions: Polyganum aviculare contains the flavonols avicularin, myricitrin, juglanin, astragalin, betmidin and the lignan aviculin.
*Figures in grams (g) or miligrams (mg) per 100g of food.
*Leaves (Fresh weight)
*0 Calories per 100g
*Water : 81.6%
*Protein: 1.9g; Fat: 0.3g; Carbohydrate: 10.2g; Fibre: 3.5g; Ash: 3.5g;
*Minerals – Calcium: 0mg; Phosphorus: 0mg; Iron: 0mg; Magnesium: 0mg; Sodium: 0mg; Potassium: 0mg; Zinc: 0mg;
*Vitamins – A: 0mg; Thiamine (B1): 0mg; Riboflavin (B2): 0mg; Niacin: 0mg; B6: 0mg; C: 0mg;
Anthelmintic; Antiphlogistic; Astringent; Cardiotonic; Cholagogue; Diuretic; Emetic; Emollient; Expectorant; Febrifuge; Haemostatic;
Lithontripic; Purgative; TB; Vasoconstrictor; Vulnerary.
Polyganum aviculare is a safe and effective astringent and diuretic herb that is used mainly in the treatment of complaints such as dysentery and haemorrhoids. It is also taken in the treatment of pulmonary complaints because the silicic acid it contains strengthens connective tissue in the lungs. The whole plant is anthelmintic, astringent, cardiotonic, cholagogue, diuretic, febrifuge, haemostatic, lithontripic and vulnerary. It was formerly widely used as an astringent both internally and externally in the treatment of wounds, bleeding, piles and diarrhoea. Its diuretic properties make it useful in removing stones. An alcohol-based preparation has been used with success to treat varicose veins of recent origin. The plant is harvested in the summer and early autumn and is dried for later use. The leaves are anthelmintic, diuretic and emollient. The whole plant is anthelmintic, antiphlogistic and diuretic. The juice of the plant is weakly diuretic, expectorant and vasoconstrictor. Applied externally, it is an excellent remedy to stay bleeding of the nose and to treat sores. The seeds are emetic and purgative. Recent research has shown that the plant is a useful medicine for bacterial dysentery. Of 108 people with this disease, 104 recovered within 5 days when treated internally with a paste of knotweed
The plant has astringent properties, rendering an infusion of it useful in diarrhoea, bleeding piles and all haemorrhages; it was formerly employed considerably as a vulnerary and styptic.
It has also diuretic properties, for which it has found employment in strangury and as an expellant of stone, the dose recommended in old herbals being 1 drachm of the herb, powdered in wine, taken twice a day.
The decoction was also administered to kill worms.
The fresh juice has been found effectual to stay bleeding of the nose, squirted up the nose and applied to the temples, and made into an ointment it has proved an excellent remedy for sores.
‘Knotgrass is peculiar against spilling of blood, strangury and other kidney affections, cools inflammations, heals wounds and cleanses and heals old filthy ulcers. The Essence for tertians and quartan. The decoction for colick; the Balsam strengthens weak joints, comforts the nerves and tendons, and is prevalent against the gout, being duly and rightly applied morning and evening.’
The fruit is emetic and purgative.
Other Uses:..Dye…….Yields a blue dye that is not much inferior to indigo. The part used is not specified, but it is likely to be the leaves. Yellow and green dyes are obtained from the whole plant. The roots contain tannins, but the quantity was not given
Known Hazards: Although no specific mention has been made for this species, there have been reports that some members of this genus can cause photosensitivity in susceptible people. Many species also contain oxalic acid (the distinctive lemony flavour of sorrel) – whilst not toxic this substance can bind up other minerals making them unavailable to the body and leading to mineral deficiency. Having said that, a number of common foods such as sorrel and rhubarb contain oxalic acid and the leaves of most members of this genus are nutritious and beneficial to eat in moderate quantities. Cooking the leaves will reduce their content of oxalic acid. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition
Disclaimer : The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplement, it is always advisable to consult with your own health care provider.