perennial

Japanese Cobra Lily

Arisaema hachijoense

The Story

Plant Bio

Arisaema hachijoense is a tuberous perennial plant known for its distinctive, umbrella-like spathe and spadix, with palmately divided foliage that emerges in early spring and produces striking, hooded flowers.

This species is notable for its vibrant purple and green coloration and is prized for its unique, exotic appearance, making it a popular choice among collectors of unusual foliage plants.

Uses & Benefits:

Adds unique architectural form to shaded gardens, providing year-round interest with its distinctive foliage.

Prefers moist, well-drained soils, making it ideal for rain gardens and damp borders.

Supports local pollinators and beneficial insects with its nectar-rich flowers.

Essentials

At a Glance

Plant Type

Perennial

Height

15 inches

Width

12 inches

Light

Partial Sun, Shade

Zones

6, 7, 8, 9

Water

Moist

Humidity

High

Lifespan

Perennial

Native To

Japan

Toxicity

Toxic if ingested

Bloom period

Late spring – Late fall

In flower about 7 months of the year

Planting

How to Grow

Tuck seeds into well-draining soil in early spring.
Mist cuttings regularly to maintain humidity.
Plant bulbs 2 inches deep in shady spots.
Water consistently, especially during dry periods.
Mulch around base to retain moisture.
Transplant in early fall for best results.

Pro Tip

Plant in shaded, moist areas with rich organic soil for optimal growth.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist 🌱
Apply mulch to conserve moisture
Fertilize with organic compost in spring

Don't

Avoid direct sunlight, which can scorch leaves ❌
Do not let soil dry out completely
Refrain from overwatering to prevent rot

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Mulch
Pest Check
Plant

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Shady woodland borderMoist garden bed

Companion Plants

Hostas Ferns Astilbes

Multiply

Propagation Methods

Good to Know

Common Questions

Japanese Cobra Lily questions

What zones can Japanese Cobra Lily grow in?

Japanese Cobra Lily is hardy in USDA Zones 6–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Japanese Cobra Lily deer resistant?

Yes — Japanese Cobra Lily is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Japanese Cobra Lily bloom?

Japanese Cobra Lily typically blooms in late spring through late fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Japanese Cobra Lily need full sun?

Japanese Cobra Lily does best in part shade.