🥕 True Yam
Dioscorea species (D. rotundata, D. alata, D. cayenensis)
vegetables perennial climbing vine (grown for tuber)
☀️ Sun
full sun
💧 Water
moderate, consistent during growing season
🗺️ Zones
9, 12 (6, 10 month growing season)
🪴 Soil Type
well-draining, deep, fertile, loose
🧪 Soil pH
5.5-7.0
💧 Drainage
Well-drained
📏 Spacing
36-48 in. apart, 48-60 in. between rows (vine; needs staking/trellis)
📅 Days to Maturity
180-270 days (from planting setts); 6-9 months depending on variety and climate
🍴 Edible Parts
🍽️ ["Pounded yam (fufu)🍽️ boiled🍽️ roasted🍽️ fried🍽️ yam porridge🍽️ flour"]
🤝 Companions (5)
🤝 corn
Corn provides sturdy living stakes for true yam's vigorous climbing vines; yam's deep roots break up subsoil while corn's shallow roots feed near the surface.
🤝 trellis crops
NOT sweet potato—true yams are Dioscorea species, staple in Africa. Vigorous climbing vine needing strong support. Traditional intercropped with corn and cassava. Tubers can reach 100+ lbs.
Pigeon peas serve as living trellises for yam vines while fixing nitrogen into soil — a traditional African intercropping system benefiting both crops.
🤝 cassava
Cassava's sturdy stems support yam vines while cassava's deep tubers and yam's shallow-rooted vines occupy different soil zones with minimal competition.
🤝 bananas
Bananas provide shade and wind protection for young yam plants; yams use banana pseudostems as climbing support in this classic tropical polyculture.
⚠️ Keep Apart (1)
⚠️ small plants smothered by vines
Growth inhibition or competition
💊 Medicinal Uses
Contains diosgenin (steroidal saponin precursor used in pharmaceutical synthesis of progesterone and cortisone) and allantoin (wound-healing compound). Diosgenin was historically used for birth control research. Traditional remedy for menstrual issues, menopausal symptoms, and digestive health. Rich in complex carbohydrates and vitamin C.
📝 Notes
NOT sweet potato—true yams are Dioscorea species, staple in Africa. Vigorous climbing vine needing strong support. Traditional intercropped with corn and cassava. Tubers can reach 100+ lbs.