- Reference
- Abh.Math.-Phys.Cl.Königl.Bayer.Akad.Wiss. 1:365-367 (1829)
- Conservation Code
- Not threatened
- Naturalised Status
- Alien to Western Australia
- Name Status
- Current
Floating-leaved, aquatic rhizomatous, perennial, herb. Fl. yellow, Dec. Swamps & rivers.
Distribution
- IBRA Regions
- Swan Coastal Plain.
- IBRA Subregions
- Perth.
- Local Government Areas (LGAs)
- Busselton, Swan.
Management Notes (for the Swan NRM Region)
General Biology. Life form. Perennial. Reproduction. The plant has vertical knobbly rhizomes which take root in the substrate and produce new horizontal stems (stolons). If these stolons break, they can re-establish elsewhere.. Fire response. Aquatic species, therefore not affected by fire..
Notes. Aquatic perennial, with emergent leaves and flowers. Leaves are waxy, elliptical and become erect when crowded. Flowers are yellow. Underwater rhizomes produce white horizontal stems (stolons) that produce new plants at the nodes. New plants forming at the nodes can easily detach and establish elsewhere..
Additional information. Origin. Native to southern USA and northern Mexico.. History of use/introduction. Extensively used as an aquatic ornamental..
Suggested method of management and control. Water lily can be manually cut and removed, but it is difficult to control as it can re-establish from seeds and rhizomes. Apply glyphosate or aquatic approved herbicide twice per year, treatment during late summer/ autumn when water levels are lowest increases efficiency. Read the manufacturers' labels and material safety data sheets before using herbicides. For further information consult the Australian Pesticides and Veterinary Medicines Authority to determine the status of permits for your situation or state.
References
- Hofstra, Deborah & Champion, Paul & Dugdale, Tony & Fridman, M & Baker, R & Finlay, M (2013) Comparison of use rates and treatment timing with glyphosate to control Mexican water lily. Journal of Aquatic Plant Management, 51: 69-76.
- Inverell Shire Council (2017) The Northern Tablelands Regional Strategic Weed Management Plan 2017-2022. NSW Government, NSW. URL: https://inverell.nsw.gov.au/wp-content/uploads/2018/09/WCMP_Mexican_Water_Lily.pdf - Accessed May 2019.
- Queensland Government (2016) Weeds of Australia. Identic Pty Ltd for Biosecurity Queensland URL: https://keyserver.lucidcentral.org/weeds/data/media/Html/nymphaea_mexicana.htm - Accessed May 2019.