Arisaema Species, Cobra Lily, Jack in the Pulpit, Japanese Cobra Lily

Arisaema ringens

Family: Araceae (a-RAY-see-ee) (Info)
Genus: Arisaema (air-uh-SEE-muh) (Info)
Species: ringens (RIN-jens) (Info)
Synonym:Arisaema ringens var. glaucescens
Synonym:Arisaema ringens var. sieboldii
Synonym:Arisaema ringens var. praecox




Ponds and Aquatics

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Sun to Partial Shade

Light Shade

Partial to Full Shade


Grown for foliage


Good Fall Color




Foliage Color:



18-24 in. (45-60 cm)

24-36 in. (60-90 cm)


15-18 in. (38-45 cm)

18-24 in. (45-60 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)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Where to Grow:

Unknown - Tell us


Parts of plant are poisonous if ingested

Bloom Color:

Chartreuse (yellow-green)

Medium Purple


Bloom Characteristics:

Unknown - Tell us

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Spring

Late Spring/Early Summer

Other details:

Unknown - Tell us

Soil pH requirements:

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:


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

Seed does not store well; sow as soon as possible


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

Deer, Arkansas

San Leandro, California

Old Lyme, Connecticut

Bartow, Florida

Quincy, Illinois

Bloomington, Indiana

Bloomfield, Iowa

Louisville, Kentucky

Melbourne, Kentucky

Gardiner, Maine

Skowhegan, Maine

Brookeville, Maryland

Bridgewater, Massachusetts

Marshfield, Massachusetts

Millbury, Massachusetts

Northfield, Massachusetts

Rutland, Massachusetts

Cadillac, Michigan

Erie, Michigan

Saint Helen, Michigan

West Branch, Michigan

Minneapolis, Minnesota

Piedmont, Missouri

Saint Louis, Missouri

Helena, Montana

Stockton, New Jersey

Hilton, New York

Roxbury, New York

West Islip, New York

Charlotte, North Carolina

Cincinnati, Ohio

Coshocton, Ohio

Glouster, Ohio

Walterville, Oregon

Greencastle, Pennsylvania

Norristown, Pennsylvania

Philadelphia, Pennsylvania

Schwenksville, Pennsylvania

Tidioute, Pennsylvania

Wilkes Barre, Pennsylvania

West Warwick, Rhode Island

Elgin, South Carolina

Nashville, Tennessee

Lexington, Virginia

Kingston, Washington

Madison, Wisconsin

show all

Gardeners' Notes:


On Oct 21, 2015, danumkc from Kingston, WA wrote:

One of my favorite Arisaemas that goes from march to frost if properly sited. A true gem for all shade gardens.


On Jul 4, 2011, stormyla from Norristown, PA (Zone 6b) wrote:

I planted two of these three years ago. The one came up the following year and bloomed beautifully. The other never materialized. I thought that it fell victim to the damp soil or to the voles. The following year both plants emerged from the ground. The sleepy one did not bloom but grew well.


On Jun 12, 2008, Strever from Hiouchi, CA (Zone 8b) wrote:

Arisaema ringens is an Asian Arisaema
the only images above that look like they are A.ringens are the 2 by bootnall and the 1 by rcn48
the rest are most likely all Arisaema triphyllum



On May 5, 2006, enya_34 from Madison, WI wrote:

It overwintered in 2006 in my zone 5 with no protection. It came up a couple of weeks later than the native Arisaema triphyllum. I am yet to see if there will be berries.

The flower does remind the cobra, hence the name the cobra lily. However, most of the photos in the PlantFiles are wrong. So I suspect same is true about the hardiness reports.


On Feb 12, 2006, rcn48 from Lexington, VA (Zone 6a) wrote:

Although these plants look 'exotic', they are really very easy to grow. Well drained soils, particularly in winter, are essential as the plant grows from a corm. You need to avoid winter wet/rot. Ours has been growing happily in unamended heavy, clay soil. Morning sun is okay for this plant, but otherwise should be grown in a shady location. After three growing seasons in our garden, this beauty is about "knee high". A. ringens multiplies more rapidly than other Arisaema species.


On Aug 5, 2003, artsgirl from Quincy, IL wrote:

I have had excellent success with Jack in the Pulpits in my very shaded, woody garden area...also dividing and sharing the bulbs...they thrive under my hemlocks in a cool, moist environment.


On Aug 4, 2003, Ladyfern from Jeffersonville, IN (Zone 6a) wrote:

Seed may take 2 years to sprout, and plants take a few years to reach blooming size. The corms can produce offsets, thereby forming a colony. Dig corms when foliage is yellowing; they may be as deep as 12". Replant at 6" deep.


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

Naturally occuring mutations can result in plants that have some leaf variegation, usually darker veins or ribs, occasionally light.

Make sure gloves are worn when handling seeds: they contain toxins that can cause numbness lasting several hours to several days. Thoroughly remove all fruit pulp and rinse seed several times in clear water to remove germination-inhibiting chemicals present in the fruit.

Best way is to plant the seeds immediately they are ripe where plants are desired. Storing for later use usually requires complex dormancy-breaking techniques.

Bulbs produce offsets in most years which can be lifted and planted elsewhere.

Plants can be grown in standing water during winter/spring, but prefer to be drier when dorman... read more