Click on images to enlarge
infestation (Photo: Jan Samanek, State Phytosanitary Administration, Bugwood.org)
habit (Photo: Jan Samanek, State Phytosanitary Administration, Bugwood.org)
leaves (Photo: Sheldon Navie)
leaf (Photo: Sheldon Navie)
close-up of leaf underside showing hairs (Photo: Sheldon Navie)
flower clusters (Photo: Jan Samanek, State Phytosanitary Administration, Bugwood.org)
flowers and developing fruit (Photo: Jan Samanek, State Phytosanitary Administration, Bugwood.org)
Fallopia sachalinensis (Schmidt) Ronse Decr.
Polygonum sachalinense SchmidtReynoutria sachalinensis (Schmidt) NakaiTiniaria sachalinensis (Schmidt) Janch.
elephant ear, giant knotweed, ostrich fern, sachaline, Sakhalin knotweed, spreading knotweed
This species originated in northern Japan (i.e. Hokkaido and Honshu) and north-eastern Russia (i.e. Sakhalin Island and the Kurile Islands).
Giant knotweed (Fallopia sachalinensis) is not widely naturalised in Australia, currently being limited to a few isolated infestations on the central tablelands of New South Wales and in southern Victoria.
However, it is widely naturalised in other parts of the world (e.g. in Europe and North America).
Giant knotweed (Fallopia sachalinensis) is regarded as a potentially serious environmental weed or "sleeper weed" in many parts of southern Australia. It has the ability to rapidly invade riverbanks, riparian areas and sites subject to disturbance, displacing all other vegetation by shading and root competition. Its long-lived underground stems (i.e. rhizomes) are able to penetrate to great depths and spread over large distances laterally, making established infestations very difficult to remove. This provides giant knotweed (Fallopia sachalinensis) with a competitive advantage over other less vigorous native plants. It also forms dense thickets of aboveground vegetation which shade out other species and prevent their regeneration, reducing the biodiversity of invaded areas and altering the habitat available to native animals.
Giant knotweed (Fallopia sachalinensis) is already a significant environmental weed in parts of Europe and North America.
Fact sheets are available from Department of Employment, Economic Development and Innovation (DEEDI) service centres and our Customer Service Centre (telephone 13 25 23). Check our website at www.biosecurity.qld.gov.au to ensure you have the latest version of this fact sheet. The control methods referred to in this fact sheet should be used in accordance with the restrictions (federal and state legislation, and local government laws) directly or indirectly related to each control method. These restrictions may prevent the use of one or more of the methods referred to, depending on individual circumstances. While every care is taken to ensure the accuracy of this information, DEEDI does not invite reliance upon it, nor accept responsibility for any loss or damage caused by actions based on it.
Copyright © 2016. All rights reserved. Identic Pty Ltd. Special edition of Environmental Weeds of Australia for Biosecurity Queensland.
The mobile application of Environmental Weeds of Australia is available from the Google Play Store and Apple iTunes.