Arisaema thunbergii

A lowland Japanese and Korean jack-in-the-pulpit with a long whip-like spadix appendage, grown from a tuber. It comes up in spring in deciduous woodland and bamboo thickets, grows through the hot, wet summer and dies back for a cold winter. All parts contain calcium oxalate and are poisonous.

At home, aim for

Day IntermediateTargets 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 in the ground

Where it grows wild

Woodland floor and forest edges in lowland deciduous or mixed forest, typically in moist, humus-rich soil under a summer canopy.

Recorded at 0–750 m (median 140 m); Japanese populations are mainly lowland.

JapanSouth KoreaTaiwan

🔒 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.