Drdawg, Cleaning out the pantry last year I found a sweet potato that we bought at the farmers market. It had sprouted but still felt pretty firm. Always being one to experiment i buried it right at the bottom of the hugel bed. It sprouted and quickly spread and right in time for thanksgiving we had at least 15 pounds of sweet potato. My main point I guess is that you should always try, you may be pleased with the results.
Here is a picture of the harvest we got (I also threw a potato in and it kind of grew a few little guys...i need to clean out our pantry more often
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