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Amorphophallus konjac (Devil's tongue)

Other names: Snake palm, Umbrella arum, Voodoo lily, Amorphophallus rivieri, Amorphophallus mairei, Konjaku, Konnyaku, Konjac

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Species
A. konjac is a tuberous perennial with erect, ovate, purple-brown spathes borne on spotted stalks in summer followed by orange-red berries. The flower and fruit are followed by a single, large, dissected leaf with elliptic, mid-green leaflets borne on a mottled, olive-green and brownish-white leaf stalk.
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Season of interest

Flower

Spring Summer Autumn Winter
Flower

Foliage

Spring Summer Autumn Winter
Foliage
Height and spread

Height and spread

Size Max height Max spread To maturity
1.3 m 2 m 1-2 years
4 ft 6 ft 1-2 years

Where to grow

Soil type
  • Loamy
Soil drainage
  • Moist but well-drained
  • Moisture-retentive
Soil pH
  • Acid
  • Neutral
Sunlight
  • Partial Shade
Aspect
  • West
  • South
Exposure
  • Sheltered

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Additional plant details

Cultivation

Plant dormant tubers 10cm deep in late winter/early spring in moist, humus-rich soil in partial shade. In containers, use deep pots at least twice the diameter of the tuber. Water freely & feed monthly in growth. Reduce water as foliage dies.

Suggested uses

Containers/Patio, Beds and borders, Sub-Tropical, Greenhouse, Conservatory

UK hardiness

H1b

USDA zones

Zone 7, Zone 8, Zone 9, Zone 10, Zone 11, Zone 12

Sunset zone

WUCOLS

North-Central Coastal = Unknown
Central Valley = Unknown
South Coastal = Unknown
South Inland = Unknown
High and Intermediate Desert = Unknown
Low Desert = Unknown

Foliage

Deciduous

Habit

Erect

Native to

China, Vietnam

Drought tolerant

No

Flood tolerant

No

Toxicity

Not toxic

Plant care

Pruning

Propagation methods

Seed, Offsets

Propagation

Sow seed with heat as soon as ripe.

Pests

Glasshouse red spider mite

Root mealybugs

Whitefly

Diseases

Cut down, pot up and store overwinter in a cold frame or greenhouse

Separate bulb offsets

Bring tender indoors if container grown (in cold areas)

Apply a fertiliser container grown plants regularly

Other plants

Plants in this Genus (2)

Amorphophallus

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Amorphophallus konjac
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Amorphophallus konjac Devil's tongue
Amorphophallus bulbifer
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Amorphophallus bulbifer Voodoo lily
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Companion plants (0)

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