Hard to believe how time has flown, but the16th DG annual photo contest has begun! Find the details here. Best wishes to all the entrants!!!

Cobra Lily, Jack in the Pulpit

Arisaema costatum

Family: Araceae (a-RAY-see-ee) (Info)
Genus: Arisaema (air-uh-SEE-muh) (Info)
Species: costatum (kos-TAH-tum) (Info)


Alpines and Rock Gardens



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


6-12 in. (15-30 cm)

12-18 in. (30-45 cm)


9-12 in. (22-30 cm)

12-15 in. (30-38 cm)


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:

Sun to Partial Shade

Light Shade


All parts of plant are poisonous if ingested

Bloom Color:

Dark Purple/Black

White/Near White

Bloom Time:

Late Spring/Early Summer

Mid 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:

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; sow indoors before last frost

From seed; direct sow after last frost

From seed; germinate in a damp paper towel

Seed Collecting:

Remove fleshy coating on seeds before storing

Wear gloves to protect hands when handling seeds

Gardeners' Notes:

No details have been posted.