New Zealand Pigmyweed, also known as Australian Swamp Stonecrop, was originally sold in garden centres as an ‘oxygenating plant’.
The rapidly growing weed grows all year round and can quickly smother native vegetation.
Spreading across the country since the 1970s, this yellow and green stemmed nasty can re-grow from tiny fragments and lives in a variety of habitats, from three metre deep canals to damp ground.
The weed has the potential to cause absolute havoc along Britain’s canals and rivers, by forming a dense mat over the water’s surface that blocks out light and oxygen, killing anything living beneath it.
Last date edited: 29 July 2015