New Zealand pigmyweed

Crassula helmsii  

Habitat

Aquatic (either submerged or emergent) in still or slow flowing water bodies or terrestrial around pond or lake margins.

Key ID features

• Leaves up to 2cm long in opposite pairs. 

• Distinctive mats of fleshy leaves when emergent or terrestrial. Submerged leaves are less recognisable. 

• Has small white flowers.

Distribution

Widespread in England, less common in Wales.

Impacts

Dense mats outcompete native flora and can impede drainage, causing flooding.

Do’s & Don’ts

• DON’T buy from any outlets for aquariums and water gardens. It is banned from sale in the UK.

• DO check whether this plant is present in your pond/aquarium - it’s really a monster in disguise.

• DO dispose of invasive non-native plants responsibly – leave to dry in a sunny area 3m away from water. Can be composted or burned (in line with local restrictions) once completely dried.

• DO be a responsible water user.Follow the guidance and Check - Clean - Dry your kit and equipment

• DON’T break the law - Be Plant Wise - don’t dump invasive non-native aquatic plants in the wild or transfer to other ponds. If you cause New Zealand pigmyweed to spread you may be guilty of an offence under the Wildlife and Countryside Act, 1981.

More Information

For more information visit the GB Non-Native Species Secretariat website.