From Ground to Stomach – Sweet Potato

The Story of the Sweet Potato

Who Knew a Sweet Potato Had This Much of a Story?

Growing up, there was a bit of wisdom about sweet potatoes that I heard from the old-timers: wait until the first frost because it makes the sweet potatoes sweeter. We usually did. Nobody stood in the garden explaining enzymes, starch conversion or postharvest physiology. You waited until the weather turned, dug the potatoes, stored them and eventually ate them. And those potatoes really did seem sweeter.

Like a lot of old farm wisdom, there was an observation behind the tradition, even if science would eventually give us a somewhat different explanation. Sweet potatoes really do become sweeter, but frost isn’t working some kind of magic underground. Much of that transformation occurs after the sweet potato leaves the ground, during curing and storage.

That journey—from planting to harvest, curing and eventually the kitchen—is a much bigger story than I expected when I started looking into it.

It Doesn’t Begin With a Seed

Sweet potatoes aren’t grown quite the way many people imagine. Commercial growers and home gardeners generally start with slips, which are shoots produced from sweet potatoes and then transplanted into the field. In southern Louisiana, LSU AgCenter guidance says slips can generally be transplanted from late April through the end of June. Depending on the variety and growing conditions, harvest may come roughly 90 to 120 days later.

Once established, those slips produce the sprawling green vines familiar to anyone who has grown sweet potatoes. Underneath those vines, out of sight, the plant develops enlarged storage roots—the things we call sweet potatoes. Given enough warm weather, water and time, those roots continue to develop until eventually it is time for one of the most satisfying parts of gardening: digging to discover what has been growing beneath you for months.

Anyone who has dug sweet potatoes also knows there is a certain amount of suspense involved. You push a fork or shovel into the soil while hoping you haven’t put it straight through your best potato. The roots are surprisingly vulnerable at harvest. Their relatively delicate skins can be scraped and bruised during digging and handling, and those wounds can shorten storage life.

That means getting a sweet potato out of the ground isn’t really the end of producing a good sweet potato. In some ways, it is the beginning of producing the sweet potato we actually want to eat.

What About That First Frost?

This is where the old-timers’ advice becomes particularly interesting. Sweet potatoes harvested in fall and eaten weeks later really can be sweeter than they were when freshly dug. Modern horticultural guidance, however, recommends getting sweet potatoes out of the ground before freezing weather damages the roots. Louisiana guidance has specifically advised harvesting before frost.

So were generations of gardeners simply wrong? I don’t think that’s the most useful way to look at it. They were observing something real, even if they didn’t have today’s scientific explanation for what was happening.

Freshly harvested sweet potatoes are sometimes called “green” sweet potatoes, and freshly dug roots aren’t necessarily as sweet and moist as the baked sweet potato many of us remember. After harvest comes an important process called curing. The newly dug roots are held under warm, humid conditions for several days. This allows cuts and scrapes caused during harvest to begin healing, reduces the likelihood of decay during storage and begins changes that improve eating quality.

Storage continues that transformation. Changes involving carbohydrates and sugar-producing enzymes contribute to the sweetness, aroma and texture we associate with a good sweet potato. LSU AgCenter has described approximately six to eight weeks of proper curing and storage as the period in which roots develop the sweet, moist characteristics particularly desirable for baking.

Perhaps, then, we should give those old gardeners some credit. They knew what their mouths told them. The potatoes they ate later really were sweeter; they just didn’t have a laboratory telling them exactly why.

Louisiana’s Surprisingly Large Role in the Sweet Potato

Louisiana has an unusually important place in sweet-potato development through LSU’s breeding program, and “important” isn’t an exaggeration. The LSU AgCenter Sweet Potato Breeding Program is one of only a few active public sweet-potato breeding programs in the United States, and varieties developed in Louisiana have been grown far beyond the state’s borders.

The LSU AgCenter Sweet Potato Research Station at Chase, Louisiana, has spent decades working on sweet potatoes. Its work encompasses breeding, production research, pest and disease issues, and maintaining high-quality planting material for growers. That research has affected not only what Louisiana farmers grow but also what consumers elsewhere in the country may eventually encounter at a market or grocery store.

Perhaps its most famous contribution is a sweet potato that millions of Americans have probably eaten without ever knowing about its Louisiana connection: Beauregard. Released by the Louisiana Agricultural Experiment Station in 1987, Beauregard went on to become an important commercial variety well beyond Louisiana. Its combination of production characteristics, attractive roots and orange flesh helped establish it as an industry standard.

Louisiana breeding didn’t stop with Beauregard. LSU researchers have developed varieties including Evangeline, Orleans, Bayou Belle, Bellevue, Bonita, Murasaki-29, Vermilion and Avoyelles, among others. The differences between them aren’t simply names on a grower’s list. Some of those differences matter to farmers because of yield, shape, disease resistance or maturity time, while others can matter to processors and cooks because of sweetness, texture, color and how the roots behave when prepared.

Is There Really a “Best” Sweet Potato?

There might be, but first we have to ask: best for what? The answer for a farmer who needs good yields and marketable roots may be quite different from the answer for someone making fries, baking a pie or looking for an especially sweet potato to put directly into the oven.

Orleans, for example, has orange flesh and resembles Beauregard but was developed to produce more consistently shaped roots. It has become an important fresh-market variety. Recent LSU research provides another reason for cooks to pay attention to it: researchers have found Orleans particularly suitable for producing a smooth purée and have investigated that purée for foods including smoothies, yogurt, baby food and even ice cream.

Evangeline deserves attention when sweetness is particularly important. LSU research has reported higher sucrose levels than Beauregard, contributing to its notably sweet flavor and making it an interesting variety for preparations where the natural sweetness of the root is supposed to take center stage.

Bayou Belle, with its deep orange flesh and red-to-purple skin, has characteristics particularly suited to processing and has been identified as a good candidate for sweet-potato fries. Murasaki-29, meanwhile, reminds us that sweet potatoes don’t all have orange flesh. This Japanese-type variety has purple skin and light-colored flesh, producing a very different appearance and eating experience.

One of LSU’s newer releases, Avoyelles, offers another kind of advantage: time. Released in 2024, it can reach harvest maturity in roughly 90 days under suitable conditions, considerably earlier than many varieties that require closer to 110 or 120 days.

Once we look beyond the supermarket label that simply says “sweet potatoes,” a surprising amount of diversity appears. There isn’t necessarily one universally superior sweet potato. There are sweet potatoes particularly suited to different farmers, growing conditions, markets and uses in the kitchen.

Where America’s Sweet Potatoes Grow

Louisiana may have an outsized influence on sweet-potato genetics, but today North Carolina is the country’s production giant. USDA figures for 2025 show North Carolina producing approximately 18.86 million hundredweight of sweet potatoes from 92,000 harvested acres. California produced about 6 million hundredweight, while neighboring Mississippi produced approximately 4.71 million.

USDA withholds Louisiana’s current state production figure in its published 2025 table to avoid revealing information about individual operations, so assigning Louisiana a precise current production number would be misleading. Production volume, however, tells only part of the story. A sweet potato developed in a Louisiana research field can eventually influence what farmers plant hundreds or thousands of miles away.

That is one of the nearly invisible connections in American agriculture. The sweet potato sitting in a supermarket bin, farmers market basket or roadside-stand display didn’t simply appear there. Someone bred the variety and tested it. Someone produced the planting material. A farmer planted and cared for it, someone harvested and cured it, someone brought it to market, and eventually someone carried it home and decided what to make for supper.

Freshly Dug Doesn’t Always Mean Better

We have become accustomed to believing that every food is best the instant it leaves the farm. Sweet potatoes complicate that idea. If you encounter freshly dug sweet potatoes at a farmers market or farm stand, don’t assume something is wrong if they don’t yet have the syrupy sweetness of the baked sweet potato you remember. They may simply be uncured.

That doesn’t mean freshly harvested roots aren’t useful. They can be cooked in dishes where sweetness comes from other ingredients or where the potato is boiled, mashed, fried, candied or incorporated into a larger recipe. For the deeply sweet baked potato many people are seeking, however, patience has advantages.

Storage also matters. Raw sweet potatoes generally shouldn’t be kept in an ordinary refrigerator for extended periods because they are susceptible to chilling injury. Prolonged exposure to temperatures below their preferred storage range can result in undesirable changes in texture and cooking quality. After curing, extension recommendations commonly call for cool—but not refrigerator-cold—storage, generally around 55 to 60°F.

The sweet potato came from a warm-weather plant, and even after harvest it hasn’t entirely forgotten that.

From the Field to the Kitchen

Most of us know the familiar destinations for a sweet potato: baked sweet potatoes, candied sweet potatoes, casseroles, pies and fries. All of them deserve their place. But if farmers and plant breeders continue finding new possibilities in this crop, there is no reason cooks can’t explore a little too.

Over the next eight weeks, Cottage Kitchen Finder will follow the sweet potato from familiar Southern dishes into a few places you might not expect. We’ll begin with recognizable favorites such as Classic Southern Candied Sweet Potatoes, Savory Roasted Sweet Potatoes, Southern Sweet Potato Biscuits and a Classic Southern Sweet Potato Pie.

Then we’re going to experiment a little. One of those experiments will be a Sweet Potato Carrot Cake with Pecans and Cream Cheese Frosting, using the sweet potato not simply as a novelty ingredient but for the moisture, sweetness and character it can contribute to a genuinely good cake.

Then there is the recipe that started raising eyebrows around here: Secret Sweet Potato Chocolate Ice Cream. It won’t require an ice-cream machine—just a blender and freezer—and the goal isn’t to make something that tastes like frozen mashed sweet potatoes with chocolate added. If we’ve done our job properly, chocolate should be the first thing you taste, while sweet potato contributes body, creaminess and some natural sweetness.

And lest that sound as though we’ve wandered completely off the agricultural map, LSU researchers themselves have recently investigated sweet-potato purée for products including ice cream. Apparently we aren’t the only people wondering just how far a sweet potato can travel after leaving the field.

We may take it one step further with Chocolate Toasted-Marshmallow Sweet Potato Ice Cream. After all, research should occasionally be delicious.

[RECIPE LINK — Secret Sweet Potato Chocolate Ice Cream — COMING SOON]

[RECIPE LINK — Sweet Potato Carrot Cake — COMING SOON]

[RECIPE LINK — Classic Southern Sweet Potato Pie — COMING SOON]

[RECIPE LINK — Southern Sweet Potato Biscuits — COMING SOON]

Eight Weeks From Ground to Stomach

Our eight-week Sweet Potato Recipe Series will begin with Classic Southern Candied Sweet Potatoes and Savory Roasted Sweet Potatoes, giving us one traditional sweet preparation and another that reminds us sweet potatoes don’t always need additional sugar. From there we’ll make Southern Sweet Potato Biscuits and a Classic Southern Sweet Potato Pie, two familiar ways generations of Southern cooks have brought this crop to the table.

During the second half of the series, we’ll move into less familiar territory with Sweet Potato Carrot Cake with Pecans and Cream Cheese Frosting, followed by Secret Sweet Potato Chocolate Ice Cream and Chocolate Toasted-Marshmallow Sweet Potato Ice Cream. We’ll finish with Savory Stuffed Sweet Potatoes, turning the sweet potato from an accompaniment into the foundation of a meal.

As each recipe is published, we’ll add its link to this article so that the story grows into a collection you can return to throughout sweet-potato season.

More Than a Recipe

This story started with a simple conversation about whether it was getting close to sweet-potato harvest time. That brought back an old memory: we usually waited until around the first frost because the old-timers said frost made the potatoes sweeter.

That memory led to questions about curing. Curing led to questions about varieties. Varieties led to LSU, and LSU led to discovering just how much Louisiana has contributed to sweet-potato breeding in the United States. Eventually that research brought us right back into the kitchen, where we somehow ended up talking about chocolate sweet-potato ice cream.

Who knew a sweet potato had this much of a story?

Perhaps that’s the larger point. When we encounter food only as something wrapped, labeled and sitting on a supermarket shelf, it is easy to forget everything that came before it. Local food gives us an opportunity to reconnect those pieces. Researchers develop better plants, farmers put them into the ground, months of weather influence what happens next, and people harvest, cure, transport, sell and prepare the resulting food.

A farmers market, farm stand, local store or food producer becomes the connection between those who grew the food and those who will eventually eat it. By the time a sweet potato reaches our kitchen, it has already traveled through agriculture, science, weather, work, tradition and sometimes generations of accumulated knowledge.

That is the journey Cottage Kitchen Finder wants to help people rediscover.

From ground to stomach, there is a lot of life—and a lot of knowledge—in between.

Classic Southern Candied Sweet Potatoes