Arisaema angustatum

A tuberous Japanese jack-in-the-pulpit of shaded forest floors in the hills and low mountains of Honshu and nearby islands. It grows through a warm, very wet summer and dies back to a tuber for a cold winter, so it wants a real winter rest rather than year-round warmth.

At home, aim for

Day IntermediateTargets 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

Forest floor and forest edges in deciduous and mixed temperate woodland, in humus-rich, moist soil.

Records span about 330–1,680 m, median around 930 m.

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. Photo from Wikimedia Commons, used under its CC BY-SA 4.0 licence, unmodified.