Hydrocotyl: declared pest

Please note: This content may be out of date and is currently under review.

Hydrocotylwater pennywort, hydrocotyle, floating marshpennywort, spaghetti weed, grote waternavel (Hydrocotyle ranunculoides) is a declared pest in Western Australia (WA). This article describes the nature of the plant with links to requirements land owners/occupiers must adhere to and pest control methods.

Form: herbaceous aquatic — perennial

Status: present in WA


Hairless perennial with long stolons that root at the nodes and grow out over the water.

Leaves: Floating, somewhat kidney to heart shaped to 10cm in diameter, lobed around the margin.

Flowers: Inconspicuous, 3mm diameter, five to ten in number on a slender stalk 2cm long. Flowering spring to autumn.

Fruit: Almost circular in outlined but compressed 2-3mm diameter, breaking into segments.

Agricultural and economic impact

An environmental weed, a water weed.

Declared pest category

The Western Australian Organism List (WAOL) contains information on the area(s) in which this pest is declared and the control and keeping categories to which it has been assigned in Western Australia (WA). Use the external links on this page to reach hydrocotyl in WAOL.

Requirements for land owners/occupiers and other persons

Requirements for land owners/occupiers and other persons if this pest is found can be sourced through the declared plant requirements link.

Search > detect > report

Report: this pest using the MyWeedWatcher smartphone and tablet application or online reporting tool.

Control method

Control methods for this declared plant can be found through the hydrocotyl control link.

Contact information

Pest and Disease Information Service (PaDIS)
1800 084 881
Page last updated: Friday, 16 December 2016 - 11:07am