Yam
Dioscorea rotundata / D. alata
About Yam
Yam is the most important tuber crop in West Africa, where it is deeply embedded in culture, cuisine, and economy. Nigeria produces 70% of the world's yam (65+ million tonnes). Two main species are cultivated: white yam (D. rotundata, preferred for pounded yam) and water yam (D. alata, higher yield potential). Yam tubers can weigh 5-20 kg and are rich in carbohydrates, vitamin C, and potassium. The 'New Yam Festival' celebrated across West Africa marks the harvest season. Yam is the most expensive staple food in Africa due to high labor requirements for planting, staking, and harvesting.
Growing Conditions
Full sun — vines climb stakes to access maximum light
1,000-1,800 mm per crop, well distributed over the 8-10 month growing season.
Deep, fertile, well-drained loam. pH 5.5-7.0. Yam requires loose soil for tuber expansion.
Optimal 25-30°C. Requires warm consistent temperatures.
Moderate to high during vine growth. Dry period triggers tuber dormancy.
Long season — 8-10 months. Plant at beginning of rainy season, harvest during dry season.
Step-by-Step Growing Tips
Cut seed tubers to 200-300 g pieces, cure 3-5 days before planting
Plant on mounds or ridges 1 × 1 m apart for white yam
Stake plants 2-3 months after emergence — essential for D. alata especially
Apply organic manure (5-10 t/ha) at planting — yam responds well to organic matter
Harvest first (milking harvest) at 6 months for fresh consumption, final harvest at 8-10 months for storage
Store tubers in ventilated barns (traditional) or apply wood ash to cut surfaces
Disease Risks to Watch
All diseases →Companion Planting
✅ Good Companions
Frequently Asked Questions
When is the best time to plant Yam?
Long season — 8-10 months. Plant at beginning of rainy season, harvest during dry season.
What soil does Yam need?
Deep, fertile, well-drained loam. pH 5.5-7.0. Yam requires loose soil for tuber expansion.
How much water does Yam need?
1,000-1,800 mm per crop, well distributed over the 8-10 month growing season.
What are the most common diseases affecting Yam?
The most common diseases are: yam anthracnose. Monitor regularly and practice crop rotation.
What plants grow well with Yam?
Good companions include: maize, melon. Avoid planting near no specific plants.
Growing Yam? Protect It.
CuraPlant scans your crops for diseases and pests in seconds — and gives you a treatment plan tailored to your region and season.