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Species library › Crassula › Crassula helmsii
Succulents Well documented

Crassula helmsii

swamp stonecrop

Swamp stonecrop (New Zealand pigmyweed) is a small, soft-leaved aquatic Crassula that grows on muddy pond margins, emergent in shallow water or fully submerged, and stays green through winter. It is native to southern Australia and New Zealand, but it is a serious invasive in Europe: it is banned from sale in the United Kingdom, and it must never be released into or disposed of near natural water.

Crassula helmsii
Photo: ashley BALSAM baz, CC BY 2.0, via Wikimedia Commons
At home, aim for
Day Cool-growingTargets in Plantistry
Night Close to the dayTargets in Plantistry
Humidity Ordinary room humidityBand in Plantistry
Light Full sunDLI and PPFD in Plantistry
No rest periodAquatic

Where it grows wild

Grows in or around permanently wet places: muddy pond and lake margins, where it forms dense carpets, semi-submerged in shallower water, or fully submerged with long stems. It keeps growing through the winter rather than dying back.

Recorded elevations are 1–1,280 m, median 574 m, from 14 of 893 records.

New South WalesNew Zealand SouthSouth AustraliaTasmaniaVictoriaWestern Australia

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates
✓ Humidity band, and how to hold it
✓ Light as DLI and PPFD for a grow light
✓ Wet and dry seasons, and whether to rest it
✓ Substrate and airflow
✓ A step-by-step setup to grow it like the wild

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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY 2.0 licence, unmodified.