Walmart, the country's largest grocer, will widen aisles, add low-profile displays in its produce departments, adding an organic shop and updating the signage throughout its stores.
Walmart is selling the changes as an improvement for both customers and workers in the produce department.
"In addition to improving the shopping experience for customers, these changes make it easier for our associates to work in the department," Walmart wrote in a blog post on Wednesday. "Our new format simplifies workloads, making it easier for our associates to stock produce. This way, they can re-focus their time on serving customers."
Last week, Amazon announced that it will open a new brick-and-mortar grocery store in Woodland Hills, California as the company looks to become a bigger player in the $700-billion-a-year U.S. grocery market.
Amazon purchased Whole Foods for $13.2 billion in 2017 and currently operates 500 stores. The company also offers grocery delivery through Amazon Fresh and Amazon Prime Now, and is planning to open cashier-less Amazon Go supermarkets and pop-up stores, possibly as soon as the first quarter.
Amazon is testing a supermarket equipped with Go technology in a 10,400-square-foot space in Seattle's Capitol Hill neighborhood, a person familiar with the project told Bloomberg.
Walmart shares were falling 0.9% to $118.85 Wednesday while Amazon shares were flat.