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PlantFiles: Northern Jack in the Pulpit
Arisaema triphyllum subsp. stewardsonii

Family: Araceae (a-RAY-see-ee) (Info)
Genus: Arisaema (air-uh-SEE-muh) (Info)
Species: triphyllum subsp. stewardsonii

Ponds and Aquatics

12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

3-6 in. (7-15 cm)
24-36 in. (60-90 cm)

USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Partial to Full Shade
Full Shade

Parts of plant are poisonous if ingested

Bloom Color:
Pale Green

Bloom Time:
Late Winter/Early Spring
Mid Spring


Other details:
Requires consistently moist soil; do not let dry out between waterings
Very high moisture needs; suitable for bogs and water gardens
This plant may be considered a protected species; check before digging or gathering seeds

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Remove fleshy coating on seeds before storing
Unblemished fruit must be significantly overripe before harvesting seed; clean and dry seeds
Wear gloves to protect hands when handling seeds
Properly cleaned, seed can be successfully stored
Seed does not store well; sow as soon as possible

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1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive lupinelover On Jun 5, 2002, lupinelover from Grove City, OH (Zone 6a) wrote:

This plant can be difficult to establish unless growing conditions are met. Plant sex is determined by previous year's growing conditions: either no sex (no flower), male or female. Usually the year following a female flowering and seed-set the plant has no flower or male flower. Must be at least one male plant in vicinity for successful germination in female.

Allow seedpod to ripen fully before harvesting. Seedpod remains in capsule. Berries can contain levels of nerve deadening chemical so make sure gloves are worn. Make sure also that all fruit is removed from seed, and seed is rinsed several times in running water; berries contain germinating-inhibitors.

Plant is magnificant in full bloom and in seed. Plants not setting seed typically go dormant in mid-June.

Bulbs produce offsets every year which can be lifted and re-planted elsewhere.


This plant has been said to grow in the following regions:

Ashton, Illinois
Palmyra, Illinois
Lonaconing, Maryland
Royal Oak, Michigan
Coopersburg, Pennsylvania
Broaddus, Texas
Blacksburg, Virginia

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