Belongs to: invasive aliens
New Zealand pygmyweed Crassula helmsii
Also known as: australian swamp stonecrop
Non-native invasive
Best time to see: Apr to mid Nov
Key facts
Forms dense mats around the edges of ponds and lakes and a dense, tangled mass underwater, destroying all other life
Previously sold as an oxygenating plant, it was banned from UK sale in 2014
Extras
Weak stems and tiny leaves make big tangled mats up to about 20 cm high
Flowers are tiny white stars, very hard to spot!
Leaves are tiny, narrow, pointed
- photo
.jpg)
© Mary Smith