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Species library › Pelargonium › Pelargonium cotyledonis
Succulents Little published: much of this is inferred from related species

Pelargonium cotyledonis

A critically endangered succulent pelargonium found only on Saint Helena. It has thick, gnarled stems, deciduous leaves and white flowers. Grow it like other dry-stemmed pelargoniums: bright light, a very open mix, and a dry, leafless rest.

Pelargonium cotyledonis
Photo: This illustration was made by Citron You must credit this : Citron / CC-BY-SA-3.0, CC BY-SA 3.0, via Wikimedia Commons
At home, aim for
Day IntermediateTargets in Plantistry
Night Close to the dayTargets in Plantistry
Humidity Dry airBand in Plantistry
Light Full sunDLI and PPFD in Plantistry
Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

Dry, rocky ground and cliffs in the arid outer parts of Saint Helena, under steady trade winds and sea air. Published habitat detail is thin.

The records cluster at one site placed at about 550 m.

St.Helena

🔒 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-SA 3.0 licence, unmodified.