Produce is often accompanied by signs like this one at a King Soopers grocery store in Fort Collins, Colo. But customers are often confused by their meaning, which is one reason the Organic Trade Association is trying to raise money for a "checkoff" to pay for consumer advertising and research. Luke Runyon/Harvest Public Media/KUNC hide caption

itoggle caption Luke Runyon/Harvest Public Media/KUNC

The Cornucopia Institute commissioned this photo of an organic egg producer in Saranac, Mich. According to Cornucopia, the facility is owned by Herbruck's Poultry Ranch, which has a license to maintain up to 1 million chickens on this site. Courtesy of The Cornucopia Institute hide caption

itoggle caption Courtesy of The Cornucopia Institute

Investigators at the U.S. Department of Agriculture have discovered cases of organic fraud abroad as well as in the U.S. In 2013, 19 farmers or food companies were fined a total of $87,000 for misusing the organic label. Mark Andersen/Rubberball/Corbi hide caption

itoggle caption Mark Andersen/Rubberball/Corbi

Organic fruits and vegetables deliver between 20 and 40 percent more antioxidants than conventional fruits and vegetables, a new study finds. Molly Marshall/Flickr hide caption

itoggle caption Molly Marshall/Flickr

Writer Arlo Crawford (left) with his father, Jim Crawford, an elder statesman of the organic farming movement who dropped out of law school in 1972 to grow vegetables. Melanie McLean/Courtesy of Henry Holt and Co. hide caption

itoggle caption Melanie McLean/Courtesy of Henry Holt and Co.

Empty shelves where eggs should be at a Whole Foods Market in Washington, D.C. The store blames increased demand for organic eggs. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

As demand for organic food in Brazil rises, organic produce is getting more affordable. Paula Moura for NPR hide caption

itoggle caption Paula Moura for NPR

Employees at Pan Fish USA, a salmon fish farm, unload fish feed on Bainbridge Island, Wash. Ron Wurzer/Getty Images hide caption

itoggle caption Ron Wurzer/Getty Images

Economists say small-business owners — especially farmers dealing in high volume and low profit margins — are more likely to accept a volatile currency like Bitcoin than bigger businesses. Allen Sheffield/Flickr hide caption

itoggle caption Allen Sheffield/Flickr

Parents now have more advice to consider when it comes to choosing organic foods. Here, Theo Shriver, 6, weighs organic produce at the Puget Consumers Co-op in Seattle. Elaine Thompson/AP hide caption

itoggle caption Elaine Thompson/AP

A shopper surveys the produce at Pacifica Farmers Market in Pacifica, Calif., in 2011. AP hide caption

itoggle caption AP

A Bhutanese farmer puts her harvest of chilies on the roof of a shed to dry and protect it from wild boars, deer, and monkeys in 2006. James L. Stanfield/National Geographic/Getty Images hide caption

itoggle caption James L. Stanfield/National Geographic/Getty Images

Edgar Jaime (right) and his brother Jose Luis unload organic vegetables from their farm in Santa Monica, Calif. Now that U.S. and European organic standards are equivalent, more American organic farmers will be able to export to Europe. Damian Dovarganes/AP hide caption

itoggle caption Damian Dovarganes/AP