All I know is that fresh greens beat the ones in tins for sure. Have to work hard to disguise canned ones, even in omelets or soups. I've always felt badly for people living in areas where convenience stores don't even offer anything fresh, not even carrots or potatoes or a wilted bunch of celery. I like it that up here some farms that were small dairy operators who didn't want to merge with the mega-dairy outfits are now growing herbs and greens for downstate supermarkets and restaurants wanting really fresh produce.
I was thinking about those urban community gardens sandwiched between high rises. They’re cool but not very efficient or have space optimization. I picture something like multi-platform levels with hydroponic irrigation systems made from PVC pipe.
They just reported today on NPR that a study of fresh produce in the city of Houston, that in low income areas the produce available for sale carried significant levels of pathogens like somonell and wisteria as compared to zero in higher income areas.