If you buy bagged salad at the supermarket, you probably don’t give much thought to where it was grown or how far it travelled to reach the shelf. But one German supermarket is changing that by growing its own lettuce on the roof, with enough space to produce up to 900,000 salad mixes a year. The REWE Green Farming supermarket in Berlin’s Lankwitz district opened on 21 May 2026…
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