Blechnum castaneum

Blechnum castaneum (Makino) Makino & Nemoto is a Japanese hard fern, often treated as Struthiopteris castanea, with separate sterile and fertile fronds. It grows in cool mountain forest, so it suits a shady, humid spot outdoors in a temperate garden better than a warm indoor terrarium. A different Philippine plant named Blechnum castaneum by Copeland is now Lomaridium contiguum and is not covered here.

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

Montane to subalpine coniferous and mixed forest floors and shaded banks in Japan, where snow covers it in winter; based on its treatment as Struthiopteris castanea.

Mostly montane to subalpine; exact limits were not found in sources we could reach.

Japan

🔒 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.