Classification
Product TypeRaw Material
Product FormFresh
Industry PositionPrimary Agricultural Product
Raw Material
Commodity GroupRoot and tuber crop
Scientific NameDioscorea alata
PerishabilityHigh
Growing Conditions- Tropical to subtropical climate
- At least 130 cm annual rainfall
- Ample moisture during the 3-5 month tuber bulking period
- Best planted at the start of the rainy season
- Short-day conditions support tuberization
Main VarietiesOriginal Kinampay, Kabus-ok, Tamisam
Consumption Forms- Fresh tubers boiled, baked, roasted, or fried
- Desserts such as halayang ubi and other sweets
- Processed powder, puree, chips, and flakes
Grading Factors- Tuber size and shape
- Flesh color
- Freedom from bruising and physical damage
- Freedom from rot and nematode damage
Planting to HarvestAbout 220-300 days from planting; usual harvest around 10-11 months after planting.
Market
Fresh ube (Dioscorea alata) is a niche fresh yam traded mainly as a high-value root crop and specialty ingredient rather than a bulk global staple. The species is native to Southeast Asia and Melanesia and has spread across tropical Asia, Africa, Madagascar, and the Pacific, but commercial identity is strongest in the Philippines. Trade quality depends heavily on careful harvest and postharvest handling because fresh tubers bruise easily and are sensitive to cold conditions. Most demand is tied to fresh sales and value-added foods such as halaya, powder, puree, chips, and desserts.
Major Producing Countries- PhilippinesCommercially grown and marketed as ube in multiple Philippine regions.
- ThailandDocumented cultivation and food-use location in the cited Purdue reference.
- IndiaDocumented cultivation and food-use location in the cited Purdue reference.
- TanzaniaDocumented cultivation and food-use location in the cited Purdue reference.
Supply Calendar- Philippines (Luzon / Cagayan Valley):Nov, Dec, Jan, FebCited Philippine production guide says harvest is usually late November to February; some growers also harvest earlier at 6-7 months when prices are favorable.
Specification
Major VarietiesOriginal Kinampay, Kabus-ok, Tamisam
Physical Attributes- Tubers can range from round to cylindrical
- Fresh flesh ranges from white to deep purple
- The tuber is starchy with a watery texture when fresh
Compositional Metrics- About 75% of dry matter is starch
- Crude protein is about 7.4%
- Reported oxalate levels range from 486 to 781 mg per 100 g dry matter
Supply Chain
Value Chain- Setts or tuber pieces are pre-sprouted, planted at rainy-season onset, and vines are staked during growth
- Harvest is followed by careful cleaning, sorting, and single-layer handling to reduce bruising
- Finished tubers are held in ventilated storage or cold storage before sale to retailers, wholesalers, or end-users
Demand Drivers- Strong household and festive use in halayang ubi and other Philippine desserts
- Value-added processing into powder, puree, chips, flakes, and ice cream
- Use as a carbohydrate-rich root crop in tropical diets
Temperature- Fresh tubers are sensitive to cold conditions
- The cited Philippine guide recommends cold storage at 12-16 C and 70-80 percent relative humidity
Shelf Life- About 3 months in raised ambient storage when kept dry and ventilated
- About 6-7 months in cold storage at 12-16 C and 70-80 percent relative humidity
- Harvest injury materially shortens storage life
Risks
Disease Pressure HighAnthracnose (Colletotrichum gloeosporioides) is identified in the cited Philippine production guide as the most serious disease of ubi. If unmanaged, it can reduce yield and marketability quickly in humid production zones.Use clean planting material, preventive fungicide or compost-tea programs, and field sanitation.
Supply Concentration MediumFresh ube is not a broad liquid global commodity, so commercial supply is concentrated in a limited set of tropical origins and smallholder zones. Weather, disease, or local logistics disruptions can tighten availability quickly.Diversify sourcing across producing zones and keep buffer stocks near destination markets.
Postharvest Damage MediumFresh tubers bruise easily and are sensitive to cold conditions, so rough harvest or handling can shorten shelf life and downgrade market quality.Harvest carefully, cushion tubers during handling, and maintain the recommended storage temperature and humidity.
Sustainability- Rainfall dependence and moisture management during tuber bulking
- Soil erosion control on sloping land through mulching and ridge management
- Invasive escape risk in non-native subtropical areas
Labor & Social- Manual labor intensity for staking, weeding, hilling, and careful harvest
- Smallholder production and contract farming shape market access for larger growers
FAQ
What is fresh ube?Fresh ube is Dioscorea alata, a yam tuber also called purple yam, greater yam, or water yam.
Where is ube mainly produced?The species originated in Southeast Asia and Melanesia and is now distributed across tropical Asia, Africa, Madagascar, and the Pacific. In the cited Philippine sources, it is commercially grown in several Philippine regions.
When is ube usually harvested?In the cited Philippine production guide, ube is usually harvested about 10-11 months after planting, with the main harvest window running from late November to February.
What is the main production risk for fresh ube?Anthracnose is identified as the most serious disease in the cited production guide, and root-knot nematodes can also damage planting material and tubers.