Nature conservation

Threatened species

Tall Knotweed - profile

Indicative distribution

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The areas shown in pink and/purple are the sub-regions where the species or community is known or predicted to occur. They may not occur thoughout the sub-region but may be restricted to certain areas. ( click here to see geographic restrictions). The information presented in this map is only indicative and may contain errors and omissions.
Scientific name: Persicaria elatior
Conservation status in NSW: Vulnerable
Commonwealth status: Vulnerable
Profile last updated: 30 Aug 2018


Tall Knotweed is an erect herb to 90 cm tall, with stalked, glandular hairs (i.e. they are knobbed when seen under a lens) on most plant parts. Its leaves are up to 11 cm long and 30 mm wide. A sheath encircles the stem at the base of each leaf, which is characteristic of its plant family. Its tiny flowers are in long, narrow spikes to 5 cm long. The pink flower-segments are less than 4 mm long.


Tall Knotweed has been recorded in south-eastern NSW (Mt Dromedary (an old record), Moruya State Forest near Turlinjah, the Upper Avon River catchment north of Robertson, Bermagui, and Picton Lakes. In northern NSW it is known from Raymond Terrace (near Newcastle) and the Grafton area (Cherry Tree and Gibberagee State Forests). The species also occurs in Queensland.

Habitat and ecology

  • This species normally grows in damp places, especially beside streams and lakes. Occasionally in swamp forest or associated with disturbance.

Regional distribution and habitat

Click on a region below to view detailed distribution, habitat and vegetation information.


Recovery strategies

Activities to assist this species

Information sources

IBRA Bioregion IBRA Subregion Known or predicted Geographic restrictions region
NSW North CoastKaruah Manning Known None
South East CornerBateman Known None
South East CornerSouth East Coastal Ranges Known None
South Eastern QueenslandClarence Lowlands Known None
South Eastern QueenslandWoodenbong Known None
Sydney BasinBurragorang Known None
Sydney BasinCumberland Known None
Sydney BasinHunter Known None
Sydney BasinMoss Vale Known None
Sydney BasinWyong Known None
Sydney BasinYengo Known None