United States / Grow / Knotweeds

Knotweeds Polygonum

This hub compares 2 species records. Across all 2 records, it carries 9 evidence rows from 8 distinct cited sources. The species split is 1 fire-resistant and 1 keep-away. The species records remain separate: their evidence does not become one verdict for the genus.

Fire-resistant: 1 species

Bukhara fleeceflower Fire-resistant Polygonum aubertii Limited evidence · 6 sources Zones 4–4

Keep away: 1 species

Japanese knotweed Keep away Polygonum japonicum (Fallopia japonica) Limited evidence · 3 sources Zones 4–4

About knotweeds

Directory notes

Plant forms recorded in this group: vine, shrub. The records span published USDA zones 4–4. These are record-level fields, not a whole-genus flammability claim.

More about Polygonum: Wikipedia — external references; not evidence sources.

Where rated knotweeds grow

Tagged as growing in 43 states.

See Polygonum on Grow → · JSON