Konjac (Amorphophallus konjac)
Konjac
About this plant
Amorphophallus konjac, commonly called konjac, is a tropical plant known for its large, unique leaf and a tall, unusual flower that emits a strong odor when blooming. It grows from a large underground tuber and is often cultivated for its edible corm, which is used to make konjac flour and jelly. The plant is interesting as a conversation piece and is sometimes grown as a houseplant or in gardens in warm climates.
Taxonomy
Higher classification: Order: Alismatales
Origin & Distribution
- Native region
- Japan, China, Indonesia
- Distribution
- Native to warm regions of East Asia, including Japan, China, and Indonesia; cultivated in various warm regions worldwide.
Care
- Suitable locations
- Indoor, Outdoor, Balcony, Greenhouse
- Preferred window facing
- East-facing, South-facing, West-facing
- USDA hardiness zones
- 8-11
- Soil pH
- 6.0-7.5 (slightly acidic to neutral)
- Soil type
- well-draining loam or potting mix
Watering. Water moderately during the growing season, allowing the soil to dry slightly between waterings. Reduce watering significantly during dormancy in winter to prevent tuber rot.
Fertilizing. Feed the plant with a balanced, diluted fertilizer every 4 to 6 weeks during the growing season (spring to early fall). Avoid fertilizing during dormancy in winter.
Amorphophallus konjac is a hardy plant that grows from a tuber. It prefers warm temperatures and well-draining soil. It needs moderate watering and can tolerate some drought. Watch for rot if overwatered. It requires some patience as it grows slowly and may go dormant in winter.
Propagation
- Propagation methods
- Seeds, Division
Ornamental features
- Flowering
- Yes
- Flowering period
- summer
Large, umbrella-like leaf; tall, striking flower with a strong odor; interesting tuber underground.
Toxicity & Safety
The plant's raw tuber contains compounds that can irritate the throat and mouth if eaten raw. Proper cooking removes toxins. Keep away from children and pets to avoid accidental ingestion.
Allergy information
Amorphophallus konjac may cause mild skin irritation in some people when handling the plant due to its sap. It is not known to produce airborne pollen that causes allergies. To reduce exposure, wear gloves when handling or cutting the plant.
Common problems
Overwatering can cause tuber rot. Low temperatures may cause the plant to go dormant or die back. Pests are generally not a major problem but watch for slugs or snails.
Uses
Grown for ornamental purposes and for its edible tuber, which is processed into food products like konjac jelly and flour.
Notes
The plant goes dormant in winter; during this time, reduce watering significantly. Repot tubers every few years in spring. Handle with gloves to avoid skin irritation from sap.