Every school should have them. Instead of competitive, aggressive sport, kids could get plenty of fresh air and exercise learning just how hard it is to grow food. I tried this once and the veg was incorporated, as far as possible, in the school meals. Digging up potatoes was like discovering gold! The kids would ask 'Is this our own?' and if it was, they'd enthusiastically eat stuff they would usually decline, partly because they owned it but also because it usually tasted better.
However, the head teacher disgraced himself. When I returned from summer holiday, there was a large indentation where a huge pumpkin had recently been. He confessed no knowledge as to it's whereabouts, but I later found in a local paper that he had won a prize for it as his own produce in his village competition! There is hope for humanity, but only if you start young.