Polygonum aviculare
Common Knotgrass
Common knotgrass is an annual, low-prostrate herb with semi-erect, branching stems. It forms patches up to about 2 m across as it matures. The plant has alternate, linear-lanceolate leaves that are longer on the main stems than on the branches. The leaves fall early, and the plant is hairless and green but may appear mealy due to powdery mildew. The inflorescences are groups of 1-6 flowers in the leaf axils, each with green flowers having white or pink margins. The fruit is a dark brown nut enclosed in the perianth.
Details
Caryophyllales
Polygonaceae
Polygonum
Polygonum aviculare contains various compounds including flavonols like avicularin, myricitrin, and juglanin; flavanoids such as astragalin and betmidin; the lignan aviculin; and the diterpene alkaloid panicudine.
Common knotgrass has been used traditionally in porridge by Germanic peoples and is an ingredient in the magic potion polyjuice in the Harry Potter series. In Vietnam, it is used to prepare soup and hot pot.
June to October
Up to 2 m across in patches
Green with white or pink margins
Fields, wasteland, roadsides, yards, and waste places
Info
Pannon Flora Ltd. was founded on December 13, 1999, by Gábor Janik, who retains 95% ownership. Janik holds an MSc in Horticulture from the University of Horticultural Sciences (1986) and an Advanced Professional English Certification from the College of International Trade (1990). The company specializes in bird feed production and export, primarily serving markets in Italy, Germany, the Netherlands, and the UK, alongside cultivating and distributing imported/exported horticultural seeds. It maintains exclusive partnerships with JOEUN Seed (South Korea) and Takii Europe (Japan), a leader in professional seed breeding and production. Pannon Flora collaborates with certification bodies such as NÉBIH (National Food Chain Safety Office), MERT Kontroll, and SGS Hungary to ensure compliance and quality. The company works with approximately 400 Hungarian growers, ranging from small-scale producers (under 5 hectares) to mid-sized farms and large-scale agricultural enterprises. This profile emphasizes agribusiness expertise, technical partnerships, and operational scalability tailored to international client needs.
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