This map shows the overall suitability of this crop in the state of Illinois.
Overall Suitability Map
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Dioscorea alata

Common Name(s): Greater yam; Chinese yam
Family: Dioscoreaceae
Growth Habit: Func. Annual/Biennial/Per
Invasiveness: Noxious weed:FL
Growing Days: 220 to 300 (days)
Abs.Max=104° (F)    Opt.Max=90° (F)
Opt.Min=72° (F)    Abs.Min=59° (F)
Precipitation: 39 to 79 (in.)
Winter Minimum: 48° (F)
Soil pH: 5.5 to 6.5
Soil Texture/Type: Light to medium textured soils
Soil Drainage: Well
Photoperiod Response: Short day
Light Intensity: Bright to clear
Tropical crop. Prefers deep soils of high fertility.
Anthrachose, Cercospora
Environ. - ornamental, Food - vegetable, Food - starch
Geographical Origin:
Widely cultivated, Asia, Pantropics
Metric Units

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Last Modified: October 17, 2012
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