Warnings to prevent spread of highly invasive water lettuce

A FAST-SPREADING aquatic weed has infested waterways at Piggabeen, prompting a removal effort by Rous County Council.

The outbreak of water lettuce covers about 400 metres of creek and has spilled onto roadsides, affecting three private properties.

The weed is classed as a priority species due to its rapid growth and ability to smother native plants, block waterways and damage aquatic ecosystems.

It can reduce water quality, block irrigation equipment and create ideal conditions for mosquito breeding.

Rous weed biosecurity manager Phil Courtney said teams were working to eradicate the infestation.

Water lettuce is often spread when sold or shared as an ornamental pond plant.

“Buying or sharing plants informally, especially online or across the border in Queensland, can result in people unknowingly introducing prohibited species into NSW,” Courtney said.

“Even well-meaning actions like sharing plants with neighbours can result in serious environmental consequences and penalties.”

The weed resembles an open head of lettuce floating on water, with roots hanging beneath the surface.

Other infestations are being managed in the Richmond River catchment at Bungawalbin, Casino, Bonalbo and Grevillia.

Under NSW biosecurity laws, it is illegal to buy, sell, grow or release the plant.

Courtney urged residents to buy only from licensed sellers and check what is legal in their state.

“Seeds from just one plant can start a major infestation,” he said.

“Early detection and prompt action are our best defences.”

Anyone who suspects they have seen water lettuce should contact Rous on 6623 3800.