Chris Ronis, co-owner of Northern Spy Food Co., a New York City restaurant, called the green a "cornerstone" of its menu. Kale salad ranked as the establishment's most popular item, outselling the next best-selling dish by 5 to 1 and garnering press with Eater and The New York Times.
While Ronis doesn't think his restaurant's kale supply would be affected by a seed scare, he is somewhat worried about prices.
Read MoreKale Caesar! Salads top the menu for workday lunches
"We source most of our produce from little and small farms, most of which would not be purchasing their seeds from a large company, I would think, so it wouldn't affect us, I'd hope," he said. "If there is a shortage at an industrial level, it still will affect our prices because people will start seeking out smaller farms and other sources."
—By Bo McMillan, special to CNBC.com