Asplenium clermontiae

A rare natural hybrid spleenwort, usually treated as Asplenium ruta-muraria × A. trichomanes. It turns up in crevices of limestone rocks and old mortared walls where both parents grow, in Europe and very rarely in north-eastern North America. It is a small, hardy crevice fern.

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

Found as single plants in the mortar joints of old walls, such as a cemetery wall at Unter-Aspang in Lower Austria, and on shaded dolomite and sandstone rock faces near Graz. One collector notes it is very rare even where thousands of both parents grow together.

Measured sites lie at about 150–550 m; wall-rue and maidenhair spleenwort both range much higher.

AustriaCzechiaSlovakiaGermanyGreat BritainIrelandItalySwitzerlandBalkan PeninsulaOhioVermont

🔒 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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More Asplenium

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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.