On warm summer nights all across the country, stadiums large and small hum with people chanting “take me out to the ballgame” in perfect unison. Kids dance, couples kiss, fans stomp and everyone — everyone — is eating peanuts.

Nearly all of the peanuts enjoyed at major and minor league baseball games hail from the peanut breeding program at a local university that has one of the only peanut breeding programs in the country that focuses on Virginia type peanuts — the kind roasted in the shells that carpet metal bleachers after final innings nationwide.

 

U.S. growers produced 5.57 billion pounds of peanuts on 1.45 million acres in 2022.

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Consumers want to see that classic peanut shape and a shell that is as bright and beautiful as possible, so a lot of our trait selections are based on the aesthetic qualities of the peanut shell. Virginia-type peanuts make up 15% of the U.S. peanut market. Most are grown in North Carolina and Virginia.

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Peanut breeders whittle down their options by first connecting which peanut traits belong to which genetic markers and selecting only the types with the traits they’re looking for. Those gene-based selections are then planted in greenhouses to verify the associations and whittle the options down further. The goal is to be able to eventually select new peanut varieties based on their genetic markers alone.

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North Carolina was the second-largest peanut producer in 2023.

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Researchers are working on forecasting which pathogens might migrate to North Carolina peanut farms as the climate warms so they can breed resistance ahead of time. Using genotypic breeding methods allows peanut breeders to go from identifying a newly emerging disease to releasing a new breeding line in seven to eight years instead of the traditional 12 to 15. 

 

Peanut breeding trials have been conducted at the Peanut Belt, Upper Coastal Plains and Border Belt Tobacco research stations, in addition to a regional project with Clemson University and Virginia Tech called the Peanut Variety and Quality Evaluations (PVQE).

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Fielding a Groundnut

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Once a new peanut variety is selected and released for farmers to plant, a whole host of other important traits come into play.

Peanuts are tricky to harvest because they are indeterminate, which means they continue flowering and producing peanut pods throughout the summer. At any given point, some pods have over ripened and rotted while others aren’t even ready. But because peanuts grow underground, the entire plant has to be harvested in one fell swoop. The peanut breeding program has focused on reducing peanuts’ indeterminate nature so that most of the peanuts are ready at the same time.

 

FAST FACTS

Peanuts are not nuts — they are legumes.
BUT… peanuts grow underground.

 

Peanuts are geocarpic. Shoots that grow on their stems bury themselves down into the soil to develop a peanut pod. Geocarpy is rare among plants.

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In the peanut world, a method called pod blasting is used to determine harvest time. This involves a power washer-like machine that removes the exocarp of the peanut pod to reveal an inner layer in a variety of fanciful hues. Black and brown pods are ready to harvest, white pods are immature, and orange and yellow pods are somewhere in between. When most of the pods are black or brown, it’s time to harvest.

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After being pulled out of the ground and left in the field to dry, the pods are shaken loose from the rest of the plant. The perfectly shaped pods then head to roasters and off to ballparks all across the country. So whichever home team you’re root, root, rooting for this baseball season, be sure to enjoy some Virginia-type peanuts. Farmers and researchers worked hard to get them into your hands.

 

The Regency Park Partnership reached out to researchers at this university,
but they declined to comment for this article.

 

 

(Editor's note: This article was adapted from “Growing a Homerun Peanut” which originally appeared at https://news.ncsu.edu/2024/05/06/growing-a-homerun-peanut