Asplenium costei

Asplenium ×costei is a natural hybrid spleenwort described by Litardière in 1911. It grows in crevices of acidic rock in southern and central France, with rare records from Spain and Corsica. It is sterile, so it survives only where plants persist or where the parent species grow together.

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

It grows in crevices of siliceous rock such as granite and schist, among its parent species on walls and outcrops. This summary is based on the ecology of French rock spleenworts, as no species-level habitat text was reachable.

Records range from 185 to 1500 m, with a median of 430 m (47 records).

FranceCorsicaSpain

🔒 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.