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I planted some garlic today and dug up one of the Jerusalem Artichoke (sunchoke) plants to check how well they did. I was able to get 7lbs of tubers off one plant and should have 70-90lbs of tubers total for the entire patch of sunchokes. That's a pretty good haul. The person I got them from originally said theirs didn't even do half as well.
Lunch was a couple sunchoke tubers, carrot, and romaine lettuce.