Asplenium herbwagneri

A rare natural hybrid spleenwort described in 1977 by W.C. Taylor and Mohlenbrock from southern Illinois, with Indiana also listed by Kew. It is reported as the cross between lobed spleenwort (A. pinnatifidum) and maidenhair spleenwort (A. trichomanes) on sandstone cliffs. It needs a cold winter and shaded rock.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Ordinary room humidityBand in Plantistry

Light Dappled lightDLI and PPFD in Plantistry

Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

Reported from shaded sandstone cliff faces where both parents grow, rooted in crevices. The parentage is recalled from the original description and could not be re-checked online. Care values are built from the measured climate and what is typical for the genus, because no species-level habitat text was reachable.

The single record carries no elevation. The Shawnee Hills region lies at about 150–300 m.

IllinoisIndiana

🔒 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.