Adiantum japonicum

A cold-temperate, deciduous five-finger maidenhair split from the Adiantum pedatum complex in 2021, native to Japan, the Kuril Islands and Sakhalin. It dies back in autumn and needs a real cold winter. It is a hardy woodland plant for a shaded garden, not a terrarium fern.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Ordinary room humidityBand in Plantistry

Light ShadeDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

Moist, shaded deciduous and mixed forest, especially on humus-rich slopes and ravines, as for other members of the A. pedatum group in north-east Asia.

Not recorded in GBIF. The measured climate comes from regional points in its range, which are cold.

JapanKuril Is.Sakhalin

🔒 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.