Arisaema sikokianum

A striking Japanese jack-in-the-pulpit with a purple-brown spathe and a snow-white club-shaped spadix, found mainly on Shikoku. It is a hardy woodland tuber that wants cool, moist shade in spring and summer and a cold winter dormancy.

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 in the ground

Where it grows wild

Grows on the floor of moist, shaded deciduous and mixed forest, often on slopes and in ravines.

Recorded mainly at 126 to 470 m (four records with elevation).

JapanShikoku

🔒 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.