Blechnum penna-marina

A small, creeping, cold-hardy fern of southern South America and the subantarctic islands, widely grown as a ground cover (now often placed in Austroblechnum). It wants cool, moist conditions and tolerates frost; the warm measured climate below comes from coarse regional placeholder sites and should not be followed.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Ordinary room humidityBand in Plantistry

Light Bright, filtered lightDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

Creeping terrestrial fern of moist grassland, peat bogs, alpine slopes, forest margins and stream banks, from the Andes to Patagonia and subantarctic islands.

Sea level in the far south to high Andean elevations further north.

ArgentinaChileBoliviaPeruBrazilFalkland IslandsJuan Fernández IslandsTristan da CunhaGough IslandSouth Georgia

🔒 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.