Polypodium saximontanum

The Rocky Mountain polypody, a small creeping fern of shaded granite crevices in Colorado, New Mexico, Wyoming and the Black Hills. It is fully cold-hardy and needs a real winter, so it is best grown outdoors in a shaded rock garden.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Dappled lightDLI and PPFD in Plantistry

Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

Grows in crevices and on ledges of granite and other siliceous rock, usually on shaded north-facing cliffs and boulders in montane conifer forest.

Recorded at 1,410–3,000 m, mostly around 2,500 m.

ColoradoNew MexicoSouth DakotaWyoming

🔒 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.