Walmart said Tuesday that it is investing in vertical farming company Plenty and plans to carry the start-up’s leafy greens in all California stores later this year.

The big-box retail giant did not disclose the size of the equity stake or the terms of the commercial deal, but said a Walmart executive will join Plenty’s board. Walmart’s investment is part of a $400 million round of funding for Plenty led by One Madison Group and JS Capital, with participation from SoftBank Vision Fund.

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