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What is Knotweed? — PlantSage

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What is Knotweed

— Short, snippet-friendly answers to the most-asked questions about Knotweed (Polygonum aviculare). For the full profile with citations, open the main page.

What is Knotweed?

Knotweed (Polygonum aviculare), a widespread annual forb or herb, is found across a broad range including Afghanistan, Alabama, Alaska, and many other regions from Europe to Asia and North America. Knotweed (Latin: Polygonum aviculare, family Polygonaceae) is a medicinal plant catalogued in PlantSage.

Is Knotweed safe?

Knotweed is generally considered safe when used at traditional doses. Always consult a clinician before using any herbal preparation — especially during pregnancy, breastfeeding, while on medication, or for children.

Where does Knotweed grow?

Knotweed is a member of the Polygonaceae family native to AFG, ALA, ASK, ALB, ABT, and ALG. Knotweed thrives in light to medium soils with a pH between 5.5 and 6.5, preferring moist conditions but tolerating a variety of soil types including sandy, loamy, and clay.

Can I grow Knotweed at home?

Knotweed grows best in USDA zone 4-8, 7/10 light, moist water, and annual life cycle. Detailed sowing, propagation, and care notes are on the full profile.

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