Huperzia appalachiana

Appalachian fir-moss is a small, tufted clubmoss of exposed rocky summits, cliffs and alpine or subarctic tundra from Labrador to the high southern Appalachians. It needs a long, cold, snow-covered winter and cool, humid summers, and is very difficult to keep long term in ordinary cultivation.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Humid airBand in Plantistry

Light Bright, filtered lightDLI and PPFD in Plantistry

Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

Grows in crevices of rock outcrops, on cliff ledges, talus and alpine or subalpine gravel, often among mosses and low shrubs, in cool, humid, windswept places.

From near sea level in the far north to about 1,900 m in the southern Appalachians; the southern sites are high summits.

Eastern CanadaNortheastern United StatesSouthern AppalachiansGreat Lakes

🔒 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.