The Story
Plant Bio
Arisaema iyoanum 'Nakaianum' is a perennial herbaceous plant distinguished by its striking, umbrella-like foliage and unique spathe and spadix flowers, typically displaying shades of green and purple.
This cultivar is notable for its particularly vibrant and patterned spathe, which enhances its ornamental appeal, along with its adaptability to shaded, woodland garden environments.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
12 inches
Light
Partial Sun, Shade
Zones
5, 6, 7, 8
Water
Moist
Humidity
High
Lifespan
Perennial
Native To
Asia
Toxicity
Toxic if ingested
Bloom period
Early spring – Late spring
In flower about 3 months of the year
Planting
How to Grow
- Tuck seeds into moist soil in fall
- Keep soil consistently moist during growth
- Provide shade during hot summer months
- Mulch around base to retain moisture
- Divide clumps every 3-4 years in early spring
- Use organic fertilizer in early spring
Pro Tip
Ensure soil stays moist and shaded for optimal growth
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil moist 🌱
- Mulch to conserve moisture
- Plant in shaded areas
Don't
- Avoid direct, hot sunlight ❌
- Do not let soil dry out completely
- Avoid heavy, compacted soil
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mulch | ||||||||||||
| Plant | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Arisaema iyoanum nakaianum questions
What zones can Arisaema iyoanum nakaianum grow in?
Arisaema iyoanum nakaianum is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Arisaema iyoanum nakaianum deer resistant?
Not reliably. Deer may browse Arisaema iyoanum nakaianum, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Arisaema iyoanum nakaianum bloom?
Arisaema iyoanum nakaianum typically blooms in early spring through late spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Arisaema iyoanum nakaianum need full sun?
Arisaema iyoanum nakaianum does best in part shade.
More Arisaema to compare
Japanese Cobra Lily
Arisaema ovale
Jack-in-the-pulpit
Arisaema triphyllum
Himalayan Cobra Lily
Arisaema consanguineum
Arisaema engleri Green Spathe Form
Arisaema engleri 'Green Spathe Form'
Nebraska Green Dragon
Arisaema dracontium 'Nebraska'
Japanese Jack-in-the-Pulpit
Arisaema serratum
Keep exploring
Explore the genus
Hardy in your zone?
Grow Arisaema iyoanum nakaianum with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.