Lagarosiphon major (Ridl.) Moss
Lagarosiphon is a State prohibited weed
State prohibited weeds are the highest category of declared noxious weeds in Victoria. By definition they are either not yet in Victoria, or are here in small numbers, where their eradication is still possible.
All sightings should be reported to Agriculture Victoria immediately by calling 136 186 or emailing email@example.com.
Why is it important to report lagarosiphon sightings to Agriculture Victoria
Lagarosiphon is an aggressive fresh water aquatic plant that prefers the cooler waters of the temperate zone, such as Victoria. It chokes still and slow moving water like lakes and dams. It depletes oxygen levels in water resulting in fish kills, and prevents recreational activities like swimming, boating and fishing.
Once established it is difficult and costly to eradicate and is easily spread between water bodies by stem and root fragments on boats and trailers.
Lagarosiphon originates from southern Africa and has become a major weed in New Zealand and parts of Europe. Plants have been found in New South Wales and Victoria, mainly as an ornamental in aquaria and ponds. All known infestations in Australia have been eradicated.
How to identify lagarosiphon
Lagarosiphon is an aquatic plant that grows submerged, either rooted to the floor of the water body or free floating. Stems can grow up to 5 m long. It tolerates a range of water conditions but grows best in sheltered, still or slow moving water bodies. Lagarosiphon has stiff, bright green to dark green leaves 5-20 mm in length, arranged in alternate spirals along the length of the stem (not in grouped whorls around the stem like its look-alikes).
Only female plants are present outside the native range, which have flowers that are very small, have three white petals and are visible on the water surface from December to April.
It can be confused with other common aquatic plants such as Elodea, Egeria and Hydrilla.
What should you do if you find a lagarosiphon plant?
If you think you have seen lagarosiphon, please contact Agriculture Victoria on 136 186 or email firstname.lastname@example.org.
Please do not attempt to treat or dispose of this weed yourself. Agriculture Victoria will treat, remove and dispose of lagarosiphon safely, at no cost to the land owner.