I've grown artichokes, perennial kale (=tree collards), and yacon (= Bolivian sunroot) for >5 years. I grow rhubarb but haven't grown to like it. The garden came with green onions, but I don't use them much. I've kept one purple peacock broccoli/kale going for at least 3 years.
I'd love to try more (and more obscure) perennial vegs.
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