Contents
Description
Dioscorea Nipponica, also known as Japanese yam or Jinenjo, is a perennial vine that belongs to the Dioscoreaceae family. The plant is native to Japan, where it has been traditionally used for medicinal purposes for centuries.
Taxonomic Information
| Domain: | Eukaryota |
| Kingdom: | Plantae |
| Phylum: | Spermatophyta |
| Class: | Monocotyledonae |
| Order: | Dioscoreales |
| Family: | Dioscoreaceae |
| Genus: | Dioscorea |
Appearance
The Japanese yam has a vine-like growth habit and can reach up to 2 meters in length. The leaves are heart-shaped and have a glossy dark green color. The plant produces clusters of small white flowers in the summer, which are followed by small bulbils that can be used for propagation. The edible tubers are elongated and can grow up to 30 cm in length.
Care Guide
The Japanese yam prefers well-draining soil that is rich in organic matter. The plant requires moderate watering and should be fertilized with a balanced fertilizer every two weeks during the growing season. The plant prefers partial shade but can tolerate full sun in cooler climates. The Japanese yam is hardy to USDA zones 4-9.
Common Pests & Diseases
The Japanese yam is relatively pest and disease-free. However, it can be susceptible to fungal diseases such as root rot and leaf blight. Pests such as aphids and spider mites can also infest the plant.
Habitat
Dioscorea Nipponica is native to Japan and can be found growing in forests and mountainous regions. The plant prefers well-draining soil and partial shade.
Question and Answer
Q: Can I grow Japanese yam in a container?
A: Yes, the Japanese yam can be grown in a container. However, it will require a large container and regular watering to prevent the soil from drying out.
Q: Are the leaves of the Japanese yam edible?
A: No, the leaves of the Japanese yam are not edible.
Q: How long does it take for the Japanese yam to mature?
A: It takes approximately 3-4 months for the Japanese yam to mature.
Q: Can I propagate the Japanese yam from cuttings?
A: No, the Japanese yam is typically propagated from bulbils or tubers.
Related Plants
- Dioscorea alata (Greater yam)
- Dioscorea bulbifera (Air potato)
- Dioscorea oppositifolia (Chinese yam)
- Dioscorea polystachya (Wild yam)
References
- “Dioscorea nipponica Makino”. Plants of the World Online. Kew Science.
- “Japanese Yam”. Purdue University Department of Horticulture and Landscape Architecture.
- “Dioscorea nipponica”. Missouri Botanical Garden.
