Most Unwanted: Fanwort
Cabomba caroliniana
Habitat: Freshwater
Threat: Clogs waterways and negatively impacts on native species and ecosystems
Status: Potential
Commonly used as an aquarium or garden pond plant, this species grows in stagnant and slow flowing freshwater systems. The species is now considered a pest in several countries and is now regarded as a potentially damaging to ecosystems in Ireland.
What is it?
This plant is an aquatic herb that generally remains completely submerged in the water column.
Impact
This species can form dense stands that crowd out well-established plants. Fanwort spreads primarily by stem fragments making control difficult if not impossible in some circumstance. Where infestation rates are high, waterways can become clogged with ecological, recreational and economic consequences. Drinking water can also become tainted by this species adding additional costs to treatment.
Where is it from?
Native to South America and also some southern states of the US.
Where is it now?
The species is currently invasive in North America, Australasia-Pacific, Australia and Asia. The species has also been recorded on sale in Britain.
How can it get here?
This is a popular aquarium plant. Transport and inappropriate disposal of this plant is considered the most likely route into Ireland
What you can do to prevent its arrival
Do not keep this plant in your aquarium.
Do not dispose of aquarium or garden material near waterways.
Report all sightings.
