Dominican Yam Sourcing: Ñame Wholesale Buyer's Guide

By Arturo Peguero | International Trade Specialist | Former Dirección de Comercio Exterior | Former International Trade Professor

Last updated: August 2026

Quick Answer: Yam (ñame, Dioscorea spp.) is a tropical tuber, not sweet potato and not yautía. Fresh yam enters the US at 6.4% duty, or 0% from the Dominican Republic under CAFTA-DR. Store at 12 to 16°C, because below 10 to 12°C the tubers chill-injure. Europe’s lane is Ghana-dominated and runs through specialised importers. Confirm species per supplier.

Most sourcing guides for Caribbean roots treat yam as one more line on the ground-provisions list, next to yuca and batata. That framing costs buyers money on this crop specifically, for two reasons. Fresh yam carries a real 6.4% US import duty where most of its shelf neighbours enter free, so origin is worth an actual percentage rather than a talking point. And yam is chill-sensitive in a way cassava and sweet potato are not, so the reefer setting that protects the rest of a mixed root pallet is the setting that destroys the yam on it. Those two facts, plus getting the species right on the purchase order, decide whether a Dominican yam program works.

Building a Caribbean root program and unsure whether yam belongs in it? We supply from our vetted Dominican Republic producer network and handle the supplier vetting, certification checks, and specification. We are a sourcing service, not a directory. Send a sourcing inquiry →

Yam Is Not Sweet Potato, and Not Yautía

Three different plants sit under overlapping names in US and European retail, and buyers order the wrong one regularly.

Yam is the genus Dioscorea: a climbing vine producing large, starchy, rough-skinned tubers. There are more than 30 known edible yam species, per the postharvest literature reviewed in a 2025 study of Dioscorea trifida storage. In Spanish-speaking markets it is ñame.

Sweet potato is Ipomoea batatas, an unrelated species. USDA’s own consumer guidance concedes the problem plainly: sweet potatoes and yams “are used interchangeably in the United States.” Practically every orange tuber sold as a “yam” in a US supermarket is a sweet potato. If your buyer says yam and means the orange one, you are sourcing batata, not ñame.

Yautía is Xanthosoma, an aroid, closer to malanga and taro than to either of the above. It shares a shelf with yam in Caribbean and diaspora retail and shares nothing else.

Why this matters commercially: a purchase order that says “yam” without a botanical name is an order the supplier will fill from whatever their local usage means. Put the genus and species on the spec. A supplier who cannot answer which Dioscorea species they are packing is not running a yam export line, whatever the catalog says.

The Cultivated Yams a Buyer Will Meet

Five species carry almost all commercial yam trade. They are not interchangeable, and their handling tolerances differ enough to matter on a container.

Species	Common names	What a buyer should know
Dioscorea rotundata	White yam, Guinea yam, African yam, Pona	The most available variety in Europe, mainly exported by Ghana. Also the least forgiving on temperature: chilling injury appears at 12.5°C.
Dioscorea alata	Water yam, greater yam	Large tubers, widely grown across the Caribbean and Pacific. Tissue breaks down within 3 to 4 weeks at either 3°C or 12°C.
Dioscorea cayenensis	Yellow yam	A cultivated species named in the postharvest literature alongside rotundata and alata, and traded into the same channels.
Dioscorea esculenta	Lesser yam	Smaller tubers with thinner skin. Handles more like a delicate root than a bulk staple.
Dioscorea trifida	Cush-cush yam, yampee	The only domesticated American yam still in commercial use, and the most cold-tolerant of the group: it has been stored at 3°C for up to 30 days.

Species-specific temperature data above is drawn from the Dioscorea trifida postharvest study; the European availability and origin picture is from CBI’s yam market-entry guidance.

Note what that table does not say. It does not say which of the five the Dominican Republic ships. That is a per-supplier question, and any page that answers it for the whole country is guessing. Ask for the species before you ask for the price.

Curing and Storage: A Standard Reefer Setting Ruins Yam

This is the single most expensive thing to get wrong, and it is the point where yam diverges from every other root on the pallet.

Yams chill-injure. They are typically susceptible below 10 to 12°C, with the general storage recommendation sitting at 12 to 16°C. D. rotundata shows injury at 12.5°C, which is inside the range a shipper might reasonably consider safe. Chilling injury on a tuber does not present at the port. It presents as internal browning and accelerated rot in the buyer’s warehouse a week later, which is where the argument about who pays starts.

Compare that against the rest of a mixed Caribbean root load. Cassava and sweet potato programs are routinely run cold, and a reefer set for them will sit well under the yam threshold. Yam either travels in its own temperature regime or it travels dedicated. Consolidating it onto a mixed root container to fill space is a false economy, and it is worth asking a prospective supplier how they have handled that in past shipments rather than whether they can.

Curing comes before storage, and it runs warm. Curing heals harvest wounds by hardening and drying the surface tissue, and it is the difference between a tuber that stores and one that rots from a bruise. The Dioscorea trifida study cured tubers at 30°C and 85% relative humidity for 65 hours. Note the direction: hot and humid, not cold. Ask three questions on this point.

1. Is the yam cured before packing, and under what conditions?
2. What is the target temperature in transit, and does the supplier set it by species?
3. What weight loss does the supplier expect across the storage window, and is that loss priced in or billed to you?

For how the same handling logic plays out across the wider category, see our Caribbean root vegetable supplier guide and the yuca and cassava sourcing guide, where the temperature answers are different.

US Entry: A 6.4% Duty That Dominican Origin Removes

Fresh yam is one of the few tropical roots where origin has a directly calculable value.

Under the US Harmonized Tariff Schedule, fresh or chilled yams fall in subheading 0714.30.10 at a general (MFN) rate of 6.4%. Frozen yam under 0714.30.20 carries 6%. Both lines list a Free special rate under program code P, which is CAFTA-DR, so yam of Dominican origin enters the United States at 0%.

That gap is the commercial case, and it is unusually legible. On a landed cost basis, Dominican origin is worth 6.4% against any supplier in a country without a US preference agreement, before anyone argues about freight or FOB. It is also worth confirming rather than assuming: preferential treatment depends on the goods qualifying as originating and on the importer being able to support the claim, which is a documentation question your customs broker owns. Our CAFTA-DR tariff guide covers how the preference works across DR produce lines.

The other US-side gate is admissibility and phytosanitary paperwork, which sits with USDA APHIS and is checked per commodity and per origin rather than assumed from a tariff line. A tariff rate tells you what a shipment costs to enter. It does not tell you that it may enter.

EU Entry: A Ghana-Dominated Lane and a Soil Limit

Europe’s fresh yam market is not a neutral field that a new origin walks into.

Per CBI, the largest supplier of fresh yams to the European market in 2022 was Ghana at 85%, followed by Costa Rica at 8%, China at 2% and Brazil at 1.7%. The Dominican Republic does not appear in that group. CBI also describes the demand shape honestly: ethnic community members are the main consumers, and practically all yams reach their destination through specialised importers rather than mainstream retail programs.

Two conclusions follow for a buyer, and they are not the same conclusion.

• If you are an EU importer already running West African yam, a Dominican offer competes against an incumbent lane with established variety expectations built around D. rotundata. Ask what species the Dominican supplier packs before you evaluate the price, because a different species is a different product to your customer.
• If you are a US buyer, the picture inverts. The Dominican Republic is close, it has a preference agreement Ghana does not, and the 6.4% duty is real money. The US lane is where a Dominican yam program is easiest to justify.

On documentation, CBI states that a phytosanitary certificate is required to export yams to the EU, as indicated in Annex XI, Parts A and B of Regulation (EU) 2019/2072. Because yam is grown in soil, there is a further requirement worth reading twice: root and tuber vegetables need an official certificate from the exporting country’s plant inspection department showing that the shipment or lot does not contain more than 1% of net weight in soil and growing medium. That is a packhouse washing and grading standard, not a form. A supplier who has never shipped roots to the EU may not have the process for it.

What to Confirm With a Dominican Yam Supplier

Yam is a genuine gap in the published Dominican sourcing picture, and honesty about the gap is more useful to a buyer than confidence about it.

The country’s own agricultural export reporting groups ñame inside a roots-and-tubers bucket alongside yuca, yautía, mapuey and batata rather than reporting it as a standalone export line, as reflected in national statistics office reporting on the category. The practical consequence: there is no reliable public figure for Dominican yam export volume, so any number quoted to you should come with a source. Within our own producer network, ñame appears inside diversified tropical lines rather than as a dedicated single-crop program, and we say so rather than dressing a catalog line as an established export lane.

That makes the confirmation list short and specific. Before you commit to a first order, get:

• Species and variety in writing, botanical name included, not just “ñame”.
• Whether the yam line is currently exporting, to which destinations, and when the last shipment moved. A catalog listing is not an export history.
• Curing and temperature protocol, per the questions in the handling section above.
• Pack format and grading, including tuber size range and count or weight per carton.
• Certification scope, not just certification. A GlobalGAP certificate held at entity level does not automatically cover every crop on the farm, and crop scope is the thing to check. Our GlobalGAP sourcing guide covers how to read a certificate properly.
• A current FOB with the Incoterm basis stated, quoted against your actual destination and volume.

A supplier who answers all six is running a yam program. A supplier who answers the first three is worth a sample order. A supplier who answers none of them has yam on a list.

Frequently Asked Questions

Is yam the same as sweet potato? No. Yam is the genus Dioscorea, a starchy tropical tuber with rough skin, known as ñame in Spanish-speaking markets. Sweet potato is Ipomoea batatas, an unrelated species. USDA notes that the two terms are used interchangeably in the United States, and most US supermarket produce labelled “yam” is in fact sweet potato. On an export purchase order, always specify the botanical name.

What temperature should fresh yam be stored and shipped at? Between 12 and 16°C. Yams are typically susceptible to chilling injury below 10 to 12°C, and Dioscorea rotundata shows chilling injury at 12.5°C specifically. That is warmer than the setting used for cassava or sweet potato, so yam should not be consolidated into a colder mixed-root container. Curing before storage runs warmer still: one published protocol used 30°C at 85% relative humidity for 65 hours.

What duty does fresh yam pay entering the United States? Fresh or chilled yams enter under US HTS subheading 0714.30.10 at a general rate of 6.4%, and frozen yam under 0714.30.20 at 6%. Both carry a Free special rate under program code P, CAFTA-DR, so yam of Dominican origin enters at 0% duty. Preferential treatment depends on the goods qualifying as originating and on the importer supporting the claim.

Which yam species does the Dominican Republic export? That has to be confirmed per supplier, not per country. Five Dioscorea species carry most commercial yam trade: D. rotundata, D. alata, D. cayenensis, D. esculenta and D. trifida. Dominican export statistics group ñame inside a roots-and-tubers category rather than reporting it by species, so no public source answers this at national level. Ask for the botanical name in writing.

What paperwork does fresh yam need to enter the European Union? A phytosanitary certificate is required, as indicated in Annex XI, Parts A and B of Regulation (EU) 2019/2072. Because yam is grown in soil, root and tuber vegetables also need an official certificate from the exporting country’s plant inspection department confirming the shipment contains no more than 1% of net weight in soil and growing medium. In practice that is a washing and grading standard the packhouse has to meet.

Work With Verified DR Root Vegetable Exporters

DominicanSources supplies Caribbean root vegetables from our vetted Dominican Republic producer network, graded and packed to your spec. We are a sourcing service, not a directory: every producer in our network has been interviewed, certifications verified, and trade activity confirmed. On yam specifically, we confirm species, current export activity and handling protocol on the line before we quote it, rather than after.

Browse verified DR specialty produce exporters

Send us a sourcing inquiry and we will quote your order from our producer network for your yam species, grade, volume, certification, and destination requirements.

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Further Reading

• Caribbean root vegetable supplier: the ground-provisions category guide
• Dominican Pigeon Pea (Guandules) Wholesale Sourcing Guide
• Yuca and cassava wholesale sourcing
• Sweet potato (batata) sourcing from the Dominican Republic
• CAFTA-DR tariff treatment for DR produce buyers
• GlobalGAP and DR fruit sourcing: reading a certificate properly

About the author: Arturo Peguero is the founder of DominicanSources, former official at the Dirección de Comercio Exterior and International Trade Professor at PUCMM with 20+ years in Dominican trade.