Plenty, which was founded in 2014 and has a vertical farm in South San Francisco, also operates an indoor plant science research facility in Laramie, Wyoming.

It's interesting that Walmart is investing a lot in the future - it's a smart strategy to place bets in a lot of sectors for a company their size. Particularly an area that is core to their offering: grocery.

CNBC: Walmart makes an investment in vertical farming start-up Plenty