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Species library › Polypodium › Polypodium amorphum
Ferns Well documented

Polypodium amorphum

A small, leathery polypody from the Pacific Northwest that creeps through moist rock crevices from the lowlands up to the subalpine zone. It is fully cold-hardy and its fronds last two years. It suits a shaded rock garden or a cool alpine house, not a warm terrarium.

Polypodium amorphum
Photo: Walter Siegmund (talk), CC BY-SA 3.0, 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 Dappled lightDLI and PPFD in Plantistry
Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

It grows mostly in moist crevices and on mossy ledges of cliffs and boulders in mountains. East of the Cascade crest it survives only in damp, high-elevation spots.

Recorded from 20 m to 2300 m, with a median near 1030 m. Most populations are montane to subalpine.

British ColumbiaWashingtonOregon

🔒 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.