Click on images to enlarge
infestation (Photo: Sheldon Navie)
habit (Photo: Sheldon Navie)
habit growing as a lawn (Photo: Sheldon Navie)
bluish-green leaves (Photo: Sheldon Navie)
close-up of creeping stems and leaves (Photo: Sheldon Navie)
typical seed-head with two main branches and tiny third branch (Photo: Sheldon Navie)
seed-head with three branches (Photo: Sheldon Navie)
close-up of immature flower spikelets (Photo: Sheldon Navie)
Digitaria didactyla Willd.
Gramineae (South Australia)Poaceae (Queensland, New South Wales, the ACT, Victoria, Tasmania, Western Australia and the Northern Territory)
blue couch, blue couch grass, blue serangoon grass, crabgrass, green serangoon grass, Qld blue couch, Queensland blue couch, Queensland bluecouch
This species is thought to have originated in the Mascarenes (i.e. in Mauritius and La Reunion). However, some authorities regard it as being native to some parts of eastern Australia (i.e. eastern Queensland and eastern New South Wales).
Naturalised near Perth in south-western Western Australia and regarded as being widely naturalised in south-eastern, central and northern Queensland. It is also present in many parts of eastern New South Wales, but some authorities regard it as being native to this area.
Blue couch (Digitaria didactyla ) is regarded as an environmental weed in some parts of Queensland and New South Wales (i.e. in the wider Sydney and Blue Mountains region and on the New South Wales North Coast). It is very widely grown as a lawn grass and is a common weed of inhabited areas.
However, it is thought to have also spread into natural habitats including tropical and sub-tropical wet sclerophyll forests, brigalow forests, wetlands, riparian areas and tropical and sub-tropical open woodlands. Blue couch (Digitaria didactyla) is probably of most concern in south-eastern Queensland, where it is currently regarded as among the top 100 most invasive plant species.
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.