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Crassula helmsii
Also called New Zealand Pigmyweed, Swamp Crassula, Swamp Stonecrop, Australian Swamp Stonecrop
Crassula helmsii is a small aquatic or semi-aquatic succulent from Australia and New Zealand that grows fully submerged or in wet margins. It is best kept in a cool-water aquarium or pond, and it is invasive in many countries, so it should not be planted outdoors where it can escape.
Crassula helmsii, known as swamp stonecrop or New Zealand pigmyweed, is an aquatic or semiterrestrial species of succulent plant in the family Crassulaceae. Originally found in Australia and New Zealand, it has been introduced around the world. In the United Kingdom, this plant is one of five introduced invasive aquatic plants that were banned from sale from April 2014, the first ban of its kind in the country. It is on the Global Biodiversity Information Facility's Global Register of Introduced and Invasive Species of eleven countries.
C. helmsii is able to grow fully submerged in a cool-water aquarium or as a submersed or marginal plant in a pond. Once established it can grow vigorously and may need to be trimmed back. Schedule 9 of the UK Wildlife and Countryside Act 1981 lists this plant as one that must not be caused to grow in the wild.
C. helmsii was recorded in 2010 throughout the British Isles, in the Netherlands, Belgium, the United States, Russia, France, Germany, Italy and Spain
Three Parted Crassula · Grassland Red Crassula · Sand Coated Crassula · Crassula alstonii · Water pygmyweed · Jade Plant · Purple Stonecrop · Crassula ausensis · Beard Stonecrop · Bandaged Finger · Silver Stonecrop · Crassula brevifolia
Text excerpted from the Wikipedia article Crassula helmsii by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
