Asplenium septentrionale

Forked spleenwort

A tiny, tufted rock fern with grass-like, forked fronds that grows in crevices of rock faces and boulders across Europe, Asia and western North America. It is a cold-hardy temperate species that needs sharp drainage, bright light and a cold winter. It resents root disturbance and is best grown in a crevice garden or alpine trough.

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 on rock (lithophyte)

Where it grows wild

Fissures in cliffs, boulders, scree and old walls, usually on siliceous rocks such as granite, gneiss and schist. Plants root deep into narrow cracks where water drains away fast, often on sunny or partly shaded faces.

From near sea level in Scandinavia to high mountains further south; about 700–2,900 m in the United States. Recorded elevations in the data run from 3 to 2,198 m with a median of 912 m.

EuropeMacaronesiaMoroccoCaucasusCentral AsiaHimalayaSiberiaChinaJapanWestern North America

🔒 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.