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The Plant Guide

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Japanese cobra lily

Arisaema sikokianum

air-iss-EE-mah si-koe-kee-AY-num Audio

The outside of the spathe is the color of dark chocolate, and the inside, milk white and as smooth as marble. Its hood sweeps up to an arrogant point, exposing its sumptuous white lining and the thick blunt spadix, which is also milk white. This plant produces two leaves per tuber, one leaf with three lobes and one with five. Sometimes they are mottled with silver, which makes them very handsome, at least until the plant goes dormant in summer.

Noteworthy CharacteristicsEasy to grow, and seedlings assure success.

CareProvide part shade to full shade and moist soil.

PropagationMost species produce offsets which can be removed in autumn.

ProblemsSlugs and vine weevils. Rust, anthracnose, leaf blight and mosaic.

  • Genus : Arisaema
  • Zones : 4, 5, 6, 7, 8, 9
  • Plant Height : 6 to 12 inches
  • Plant Width : 6 to 12 inches
  • Maintenance : Low
  • Moisture : Medium Moisture
  • Light : Partial Shade
  • Plant Type : Perennials
  • Uses : Shade
  • Characteristics : Showy Foliage, Showy Fruit
  • Bloom Time : Spring
  • Plant Seasonal Interest : Spring Interest
  • Flower Color : White
View Comments


  1. judymcelwee 09/16/2014

    Would anyone be interested in trading seeds or bulbs so it would make us more varieties. I think that would be real fun. I am planning to dedicate an entire garden to Jack in the Pulpits only. Doesn't that sound nifty? Let me know if you want to be in on the trade. ~Judy

  2. shellyloke 06/07/2017

    I have a Arisaema sikokianum wintered over from last
    year. I have waited patiently for it to
    come up but it is being stubborn. The
    bulb is there and solid but it won’t break dormancy. (I checked today to make sure it was still there and not a winter casualty.) All my other arisaemas have popped out. I even know of other sikokianum owners who’s plants are up and doing their thing.

    Is there something that I should be doing to encourage
    it? We have had plenty of rain and lots
    of good weather.

    My only thought is that we had a mild winter and it might
    not have gotten cold enough for it in the sheltered area where I planted

    Should I put it in the fridge? Should I store it somehow for next year?

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