The Story
Plant Bio
Amorphophallus koratensis, known for its large, tropical, and herbaceous form, features a distinctive, broad leaf structure and produces a tall, spadix with a spathe that varies in color, often with purple accents.
This cultivar is distinguished by its striking purple stems, which add ornamental value and make it stand out among other Amorphophallus species, especially in cultivated settings.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
18 inches
Light
Partial Sun, Shade
Zones
4, 5, 6, 7
Water
Moderate
Humidity
High
Lifespan
Perennial
Native To
Thailand
Toxicity
Toxic if ingested
Bloom period
Late summer – Late fall
In flower about 4 months of the year
Planting
How to Grow
- Tuck corms 4 inches deep in well-draining soil.
- Water regularly to keep soil moist but not waterlogged.
- Mist leaves during dry periods for humidity.
- Place in partial shade to protect from harsh sun.
- Mulch around the base to retain moisture.
- Allow corms to dry out in winter in cooler zones.
Pro Tip
Plant corms in well-draining soil with partial shade for best growth.
Keep It Thriving
Care Guide
Do
- Water consistently during active growth 🌱
- Mulch to conserve moisture and suppress weeds
- Provide partial shade in hot climates
Don't
- Avoid overwatering to prevent rot ❌
- Don’t expose to full sun in hot climates ❌
- Never disturb the corms when dormant
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Lift Store | ||||||||||||
| Pest Check | ||||||||||||
| Plant |
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
Koratensis Purple Stem Form questions
What zones can Koratensis Purple Stem Form grow in?
Koratensis Purple Stem Form is hardy in USDA Zones 4–7. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Koratensis Purple Stem Form deer resistant?
Not reliably. Deer may browse Koratensis Purple Stem Form, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Koratensis Purple Stem Form bloom?
Koratensis Purple Stem Form typically blooms in late summer through late fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Koratensis Purple Stem Form need full sun?
Koratensis Purple Stem Form does best in part shade.
More Amorphophallus to compare
Konjac Voodoo Lily
Amorphophallus konjac
Voodoo Lily
Amorphophallus bulbifer
Yulo Amorphophallus
Amorphophallus yuloensis 'PDN 1'
Pinto Voodoo Lily
Amorphophallus konjac 'Pinto'
Korat Amorphophallus
Amorphophallus koratensis 'Green Stem Form'
Koratensis Amorphophallus
Amorphophallus koratensis 'Dark Stem Form'
Keep exploring
Explore the genus
Hardy in your zone?
Grow Koratensis Purple Stem Form 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.