Wild yam
Dioscorea villosa · Dioscoreaceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around wild yam and prepare for winter.
ID card
- Form
- Twining climbing vine
- Foliage
- Deciduous
- Flowering
- Summer (July-August), inconspicuous flowers
- Mature size
- 3 to 4 m in height depending on support
- Growth rate
- Moderate to fast
- Hardiness
- Hardy down to -15 °C
- Origin
- North America (eastern United States)
- Soil type
- Well-drained soil, rich in organic matter
Care
Watering
Water regularly during the growing season, from May to September, keeping the soil moist but not waterlogged. Reduce watering in autumn and nearly stop it in winter when the plant goes dormant. Ensure good drainage to prevent root rot.
Exposure and light
Place your dioscorea in partial shade to full sun, depending on your climate. It tolerates partial shade, especially in warmer regions. Choose a location protected from strong winds.
Soil and preparation
Prepare a humus-rich substrate that is well-drained and slightly acidic to neutral. Enrich the soil at planting time with mature compost or leaf mold. Avoid compacted or excessively chalky soils.
Pruning and training
Pinch back young stems to encourage branching and bushiness. In late winter or early spring, before growth resumes, remove dead wood and weak stems. Guide the shoots onto a trellis or structure to shape the climbing vine.
Fertilizing
Apply a balanced or slightly potassium-rich fertilizer in spring (April-May), then every 4 to 6 weeks until mid-August. Use organic or diluted fertilizer to avoid excess nitrogen, which would reduce flowering.
Pests and diseases
Dioscorea is generally resistant to pests. Watch for spider mites in very dry conditions and aphids in spring. Good drainage prevents root rot. Ensure good air circulation through the foliage to limit fungal diseases.
Did you know?
The hairy dioscorea was known as "wild yam" by Native Americans, who consumed its underground tuber as a nutritious food and traditional remedy. In the twentieth century, it caught the attention of chemists who isolated sapogenins from its roots—molecules that served as precursors for synthesizing pharmaceutical compounds. Cultivated as an ornamental climbing vine, it thus combines a rich ethnobotanical past with lasting scientific fascination.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
Add this plant to my garden →Plants from the same family
- Black bryonyDioscorea communis
- Dioscorea bulbiferaDioscorea bulbifera
- Yellow guinea yamDioscorea cayenensis
- Pedunculate oakQuercus robur
- GrapevineVitis vinifera
- CamelliaCamellia japonica
Tips generated and checked by Viridia — adapt them to your local climate.