Jack in the pulpit

Arisaema triphyllum (L.) Schott

light
Part–shade
water
Medium
tall
53 cm
wide
46 cm

Araceae

Formerly Alocasia atrorubens, Alocasia lobata, Alocasia triphylla, Arisaema atrorubens, and 7 more

When it flowers

Not known yet in the tropics: too few flowering observations to read a season from.

PetsNC State Extension lists it as toxic to dogs, cats and horses (25 Oct 2026)
PeopleNC State Extension lists it as mildly poisonous (all parts) (25 Oct 2026)

If a child, a pet or anyone may have eaten a plant, contact a doctor or vet straight away, or call the National Poisons Information Centre (AIIMS, New Delhi) on 1800 116 117, free and open 24 hours.

Something wrong with it?

About it

Grows as
Tuberous geophyteKew's checklist, not yet checked
Climate
TemperateKew's checklist, not yet checked
Wild in
C. & E. Canada to C. & E. U.S.A.Kew's checklist, not yet checked
Light
Part shade to shade (under 6 h)Read from NC State Extension, one source
Height
30 cm to 76 cmRead from NC State Extension, one source
Spread
30 cm to 61 cmRead from NC State Extension, one source
Water
Average: moist, well drainedRead from NC State Extension, one source
Flowers
White, purple, green, brownRead from NC State Extension, one source
Coldest it survives
-34.4 °C (USDA zone 4a)Read from NC State Extension, one source

Not known yet: heat, hottest it survives.

In other languages (1)

Chinese
三叶南星

Where this comes from

A fact “checked by a majority of its sources” was settled by a vote of the pages it was read from, not by a person reading it; one marked “one source” rests on that page alone. Anything else not marked checked has not been checked yet. Where nothing is known, the page says so rather than guess.