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Species library › Huperzia › Huperzia porophila
Ferns Well documented

Huperzia porophila

Rock firmoss is a small evergreen clubmoss of shaded, moist, acidic sandstone and other rock outcrops in the Appalachian and Midwestern driftless regions. It is a slow, cool-temperate plant that needs a real winter and cool, humid shade, and it is difficult to keep long term in warm indoor conditions.

Huperzia porophila
Photo: Britton, N.L., and A. Brown, Public domain, via Wikimedia Commons
At home, aim for
Day Cool-growingTargets in Plantistry
Night Close to the dayTargets in Plantistry
Humidity Humid airBand in Plantistry
Light ShadeDLI and PPFD in Plantistry
Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

Grows as scattered individual tufts on or over shaded, damp, acidic rock such as sandstone boulders, cliff faces and ravine outcrops.

Recorded at 3–1,731 m, median about 210 m; most sites are low plateaus and ravines.

United StatesCanada

🔒 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 Public domain licence, unmodified.