Varieties & Cultivars
Picking the right genetics
Hundreds of named varieties exist, but the choices that matter are few: flesh color, dry matter, maturity, pest resistance, and what your market will pay for. Here is how to choose — and a field guide to the well-known names.
At a glance
- Flesh colors
- White, cream, yellow, orange, purple
- Skin colors
- Tan, copper, red, purple, white
- Dry matter
- ~20–35% depending on type
- Maturity classes
- Early 90–110 d · Mid 110–130 d · Late 130–150+ d
- Orange flesh
- Rich in beta-carotene (provitamin A)
- Purple flesh
- Rich in anthocyanin pigments
Flesh color and what it means
Skin color is mostly a market matter; flesh color is a chemistry matter. It predicts nutrition, taste, and the uses a variety suits.
| Flesh | Key compounds | Taste & texture | Best uses |
|---|---|---|---|
| Orange | Beta-carotene (provitamin A) | Moist, sweet when cured; “dessert” character | Fresh table use, nutrition programs, puree, baby food |
| Purple | Anthocyanins (antioxidant pigments) | Drier, nutty, mildly sweet | Snacks, flour, natural food color, novelty markets |
| Yellow | Moderate carotenoids | Balanced sweet | Fresh market; all-rounder |
| White / cream | Mostly starch, little pigment | Dry, mealy, less sweet; preferred in much of Africa & Asia | Boiled/roasted staple, flour, starch extraction, animal feed |
Watch out: sweet ≠ sugary
“Sweet potato” is a name, not a guarantee of sweetness. White-fleshed staple types can be quite dry and bland — ideal for filling meals and for processing, but a disappointment if your market expects dessert-sweet orange roots. Always match variety to your buyers.
Dry matter: the hidden spec
Dry matter is the share of root weight that is not water. It decides cooking quality and processing value:
- High dry matter (28–35%): mealy, firm after boiling; best for flour, starch, and frying; the preferred eating type in much of Africa.
- Medium (24–28%): all-round fresh-market types.
- Low (20–24%): soft, juicy, very sweet; “dessert” varieties and most orange-fleshed exports; poor for starch but loved as roasted treats.
Processors pay attention to dry matter because it sets the flour/starch yield per tonne of roots.
How to choose a variety
Field guide: the 5-question variety check
- Market first: What do your buyers actually want — color, sweetness, size, dry matter? Check prices for orange vs white in your market before you plant.
- Season length: Does the variety mature inside your frost-free window? Short seasons need early varieties (90–110 days).
- Resistance: Ask your extension service which released varieties resist the local pests and diseases — especially virus disease (SPVD) and weevil pressure.
- Purpose: Fresh eating, processing (flour/starch), or animal feed? Each favors a different flesh type.
- Provenance: Start from certified or known-clean planting material of a named variety — not an unlabeled mix from the market.
A field guide to major varieties
| Variety | Region | Flesh / skin | Notes |
|---|---|---|---|
| Beauregard | USA, worldwide | Orange / copper | The international benchmark orange variety; ~90–100 days, stores well, high yields. |
| Covington | USA (South) | Orange / rose-red | Excellent flavor and shape; improved nematode tolerance; the current North Carolina standard. |
| Jewel | USA | Orange / copper | Old reliable; moist, sweet; very good storage. |
| Georgia Jet | USA (North) | Orange / red | Extra-early (~90 days); bred for short northern summers. |
| Okinawan | Hawaii / Japan | Purple / tan | Purple-fleshed classic; the purple “Ube-style” flavor without being a true ube. |
| Stokes Purple | USA | Purple / purple | Deep purple flesh; drier, nutty; prized for snacks and color. |
| Murasaki | USA / Japan | White / purple | Japanese-style dry white flesh; popular for roasting. |
| Resisto | Africa (OFSP) | Orange / copper | Early, high beta-carotene, weevil-tolerant; a HarvestPlus biofortified flagship. |
| Zambezi, Tio-Joe, Jongwani | Africa (OFSP) | Orange | Biofortified orange types distributed in vitamin A programs (Mozambique, Tanzania region). |
| Ejumula, SPK004 (KEMB10) | East Africa | Orange / white | Kenyan/Ugandan releases with good yield and orange flesh. |
| UMUSPO 1–3, King J, Shaba | West Africa | Mixed | Nigerian releases including orange-fleshed and high-dry-matter types. |
| NASPOT series | Uganda | Various | Bred specifically for SPVD resistance — check the current released lines. |
For region-specific season calendars and variety notes, see the Africa, Asia & the Pacific, and temperate regional guides.
Pro tip: plant a portfolio
Rarely plant one variety alone. A mix — an early type for first cash, a high-dry-matter staple type, and an orange-fleshed type for nutrition — spreads risk from weather, pests, and price swings, and extends your harvest window.
Deep dive: breeding & biofortification
Sweet potato breeding is unusually hard. The crop is a hexaploid — six chromosome sets (2n = 6x = 90 chromosomes) — with complex genetics, and it flowers poorly in some environments — so breeders must manage pollination, seed set, and a long seedling-to-field pipeline. Most farmers never see the seed: released varieties are multiplied vegetatively, which keeps them true to type.
Biofortification is the shining success. Conventional breeding (no genetic modification) raised beta-carotene levels in orange-fleshed lines from a few hundred to many thousands of micrograms per 100 g fresh weight. Combined with vine-multiplication and farmer training, programs like HarvestPlus and national partners moved these varieties to millions of households, measurably reducing vitamin A deficiency in countries like Uganda, Mozambique, and Nigeria.
Breeders are also chasing SPVD resistance (see Diseases), drought tolerance, and higher dry matter — often trading one trait against another, which is why no single “perfect” variety exists.
Frequently asked questions
Which variety is the sweetest?
Generally the low-dry-matter orange and amber types — like Beauregard or Covington — taste sweetest, especially after curing. White-fleshed staple types are starchy and less sweet. “Sweet” is a spectrum, not a single variety.
Can I plant roots bought from the market?
Technically yes — bedded roots produce slips — but market roots are often mixed varieties, may carry weevils, and can harbor viruses. For serious production, start from certified or known-clean planting material of a named variety.
What does OFSP stand for?
Orange-Fleshed Sweet Potato — biofortified varieties rich in beta-carotene, promoted to fight vitamin A deficiency, especially in sub-Saharan Africa. They taste sweet, cook moist, and are often the highest-value fresh-market type.
Do varieties behave differently in storage?
Yes — storage life, sprouting, and chilling sensitivity vary. High-dry-matter, well-cured types generally store longest. Ask your seed supplier for storage ratings, not just yield.
Sources & further reading
This article distills field practice and science from the organizations below. Always confirm variety, chemical, and practice recommendations with your local extension service.