A reminder of the golden age of sweet potato farming

lexington county 3 19 2016 023

Located in a rural area of Lexington County, SC, is a dilapidated sweet potato drying house. If you’re unfamiliar with the concept of a sweet potato drying house, welcome to the club. I, too, had no idea such a structure existed until I happened across it recently.

From its appearance, it’s safe to say that it’s been many a year since any sweet potatoes were cured in the rectangular wooden structure. The building has a single door, four openings in the roof, and four small windows and one larger window. It was definitely not built for comfort.

Estimating its age is inexact at best, but because it was built with round-headed nails it was almost certainly built after 1890 and, from its appearance, most likely before World War I.

The structure recently achieved higher visibility because, after many years of being surrounded by thick woods, the land surrounding it was cleared, leaving it sitting in the open.

When constructed, sweet potatoes were a staple of the American diet. At the beginning of the 20th century the tubers were the second most-important root crop in the nation. Per-capita consumption of sweet potatoes in 1920 was 31 pounds, but by the start of the 21st century that figure had dwindled to just 4 pounds per person, according to the US Department of Agriculture.

Storing sweet potatoes is a relatively straightforward. The bottom line is to cure the tubers, than keep the potatoes dry, to fend off rot, and prevent them from getting too warm or too cold.

The main goal behind curing is to heal injuries so that sweet potatoes remain in good condition for marketing during the winter and to preserve “seed” roots for the next crop, according to the Cooperative Extension Service at the University of Georgia College of Agriculture.

Healing takes place rapidly at 85 degrees Fahrenheit and between 85 to 90 percent humidity, for four to seven days.

Sweet potatoes

Sweet potatoes in all their glory.

“Curing should start as soon after harvest as possible to heal injuries before disease-producing organisms gain entrance,” according to the Georgia Cooperative Extension Service. “Healing involves production of cells that are very much like the skin in their ability to prevent infection. These new cells form in a layer just below the surface of the injuries. Because this layer is corky, it is commonly called wound cork. Healing is more rapid under clean cuts and skinned areas than in deep wounds where tissue is crushed. The rate of healing differs a little among varieties.”

In the above structure, heaters and exhaust flues were used to promote circulation, remove excessive condensation and prevent accumulation of carbon dioxide produced by sweet potato roots.

The four holes in the roof were used to vent the flues.

After the tubers were cured, the temperature in the storage house was brought down to a narrow range of between 55 and 59 degrees Fahrenheit, with relative humidity maintained at between 85 and 90 percent.

Much below that and sweet potatoes experienced an increased susceptibility to rot and discoloration, and the quality of roots was diminished, hurting their ability to produce sprouts when planted the following season.

It’s unclear how common standalone sweet potato drying houses were. It’s likely most individuals who raised the tubers simply relied on earthen structures, whether dug into banks or put into holes then simply covered with dirt.

Standalone structures like the one shown above would likely have been used by more than one farmer, a cooperative of sorts, or by an individual with an extremely large spread.

(Top: Old sweet potato drying house, located in rural Lexington County, SC, west of Columbia.)

11 thoughts on “A reminder of the golden age of sweet potato farming

  1. Interesting bit of local lore. Makes me wonder why I don’t hear about sweet potato farming around here. Seems like they could be grown in southern vegetable gardens, but I’ve never seen them in local nurseries.

    (I’m a big believer in growing food instead of azaleas.)

  2. Well, if you don’t beat all! A discourse on sweet potatoes! I put out some sweet potatoes every year. I prefer Porto Rico Red but I’ve no objection to other varieties. I’m not a genuine gardener so I buy my slips. However, as farms continue to disappear in Western N.C. it is harder and harder to find practical gardening tools, plants, and seed so I might have to start my own slips. I knew that rutabagas were called swedes but I too had to look up mangel wurtzel to find that I would call them feed beets or stock beets and root clamp was a term I had never heard. I’m familiar with a similar process but I had never heard that term.

    I’ve said it before but it needs to be repeated, Cotton Boll Conspiracy is a continuing pleasure. Where else might I find history lessons and stories and thoughts on everything from elephants to sweet potatoes? You do good work.


    • Thank you so much, Jill. I love growing things, too, so anytime I can combine a bit of history with agriculture I’m all for it.

      I enjoy sweet potatoes and actually made a sweet potato pie a few years back. I think I may have to plant a few this year.

      It is unfortunate that your area is losing a lot of its farms, especially the smaller ones, but I do think there has been an increase in people growing their own vegetables. Of course, Americans are noted for taking the best farmland in an area and putting housing and other development on it, unfortunately.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s