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Willow Grass

Polygonum amphibium
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Polygonum amphibium (Willow Grass) — botanical photograph
Pl. CDB0 — Polygonum amphibium
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I

Overview

Willow Grass (Polygonum amphibium) is a perennial herb known for its edible and ornamental qualities. Native to regions including Afghanistan, Alabama, Alaska, and Algeria, this plant thrives in wet environments with light, medium, or heavy soils. Its leaves, shoots, and seeds are all edible, making it a valuable resource in certain culinary traditions. Willow Grass is characterized by its ability to grow in a variety of climates, from hardiness zones 4-8, where it can reach heights of about 0.3 meters. It prefers soil with a pH between 5.5 and 6.5, ensuring that it remains healthy and vibrant throughout the growing season.

Quick answers

What is Willow Grass?

Willow Grass (Polygonum amphibium) is a perennial herb known for its edible and ornamental qualities. Native to regions including Afghanistan, Alabama, Alaska, and Algeria, this plant thrives in wet environments with light, medium, or heavy soils.

What is Willow Grass used for?

Traditionally used for immune support, digestion. Each claim is evidence-rated — see Section II for full citations.

Best for
Top 2 evidence-ranked uses of Willow Grass
Jump to full evidence →
Clinicaluses · safety · chemistry · dosagemedicinal profile
II

Benefits & evidence

2 claims · traditional-use context
Traditional-use context
These notes are presented as ethnobotanical context. No cited clinical references are catalogued for this plant yet.
  • Willow Grass has been traditionally used in various cultures for its immune-supporting properties. A tea made from the leaves or shoots may help bolster the body's defenses.

    The plant contains polyphenols and other antioxidants that can support the immune system by reducing oxidative stress and promoting a healthy inflammatory response.

    ▲ ModerateImmune support →
  • Willow Grass has been traditionally used in European herbal medicine for digestive issues, such as bloating and indigestion. A decoction of the leaves or shoots may help soothe an upset stomach.

    The plant contains compounds like flavonoids that have anti-inflammatory properties and can support gastrointestinal health by reducing inflammation and irritation.

    ▲ ModerateDigestion →
IV·b

Mixology suggestions

1 draft
Editorial drafts. These pairings are AI-suggested from traditional herbal lore. Always verify with a qualified herbalist before brewing.
Willow Grass support blend
general
tea
AI returned a direct ingredient list; normalized into one draft blend for editorial review.
Growingconditions · propagation · uses
V

Cultivation

Willow Grass thrives in wet conditions and prefers light (sandy), medium, or heavy (clay) soils with a pH between 5.5 and 6.5. It is hardy in temperate regions from USDA zones 4 to 8. This perennial grows up to 0.3 meters tall and requires full sun to partial shade. For best results, plant edible parts such as leaves, shoots, and seeds in a moist environment with adequate drainage. Ensure consistent watering to maintain its health and productivity.
Light
6/10
Water
Wet, Water
Soil
Light (sandy), Medium, Heavy (clay)
Hardiness
4-8
Life cycle
Perennial
Habit
Forb/herb
Mature size
0.3 m tall
Soil pH
5.5–6.5
For first-time growers

How to grow Willow Grass for the first time

8steps

Willow Grass is a forgiving plant for beginners, making it an excellent choice for your first gardening project.

  1. 1

    What you'll need

    Seeds or young plants, a container with drainage holes, potting soil.

  2. 2

    Best time to plant

    Plant in spring after the last frost or in early fall.

  3. 3

    Soil and container prep

    Use well-draining soil with a pH between 5.5 and 6.5, ensuring your container has adequate drainage holes.

  4. 4

    Sowing or transplanting

    Direct sow seeds in the ground or start them indoors and transplant young plants once they have several leaves.

  5. 5

    First two weeks

    Keep soil consistently moist but not waterlogged, providing partial shade to avoid scorching.

  6. 6

    Ongoing care

    Water regularly, especially during dry spells. Mulch around the base for moisture retention and weed control.

  7. 7

    Harvest or pruning

    Prune dead foliage in late winter to maintain a neat appearance and encourage new growth.

  8. 8

    Common mistakes

    Overwatering, planting in heavy soil, neglecting to provide partial shade.

VI

Edible & utility

Edible parts:LeavesSeedShoots
Edible uses: Willow Grass (Polygonum amphibium) is eaten for its leaves, shoots, and seeds. The leaves can be consumed raw or cooked, adding a mild flavor to salads or soups. Shoots are often harvested young and used in similar ways as the leaves. Seeds can also be eaten but require processing before consumption, typically involving drying or grinding.
Other uses:Tannin
Contextrange · companions · related
VII

Distribution

156 native · 2 introduced
Distribution across4 continents· 156 native· 2 introduced
Europe25 regions
native (25)AlbaniaAustriaBelarusBelgiumBulgariaDenmarkFinlandFranceGermanyGreeceHungaryIcelandIrelandItalyNetherlandsNorwayPolandPortugalRomaniaRussiaSpainSwedenSwitzerlandUkraineUnited Kingdom
Asia15 regions
native (15)AfghanistanChinaIranIraqJapanKazakhstanMongoliaNepalPakistanSaudi ArabiaSouth KoreaTurkeyTurkmenistanUzbekistanYemen
Americas1 region
native (1)United States
Africa6 regions
native (6)AlgeriaEthiopiaKenyaLesothoMoroccoTunisia
Broader regions
native:Alabama, Alberta, Altay, Amur, Arizona, Arkansas, Baltic States, British Columbia, Buryatiya, California, Cape Provinces, Chita, Colorado, Connecticut, Czechoslovakia, Delaware, District of Columbia, East Himalaya, Føroyar, Free State, Idaho, Illinois, Indiana, Iowa, Irkutsk, Kamchatka, Kansas, Kentucky, Khabarovsk, Kirgizstan, Krasnoyarsk, Kuril Is., KwaZulu-Natal, Labrador, Louisiana, Magadan, Maine, Manitoba, Maryland, Masachusettes, Massachusetts, Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, Newfoundland, North Carolina, North Dakota, Northern Provinces, Northwest Territorie, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Primorye, Prince Edward I., Québec, Rhode I., Sakhalin, Saskatchewan, South Carolina, South Dakota, Tadzhikistan, Tennessee, Texas, Transcaucasus, Turkey-in-Europe, Utah, Vermont, Virginia, West Himalaya, West Virginia, Wisconsin, Wyoming, Yakutskiya, Yugoslavia, Yukon
introduced:Argentina Northeast, Argentina South
IX

Specimen gallery

1 image
Polygonum amphibium (Willow Grass) — botanical photograph
Willow Grass (Polygonum amphibium)
X

See also

8 related
XI

Explore further

Companion planting
Growing zone
XII

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