Answer: It might be true, but I'm not sure. Sweet potatoes can be harvested after the tops of the plants yellow, but the longer a crop is left in the gound, the higher the yield and vitamin content. Once frost blackens the vines, however, the tubers can quickly rot.
Once harvested the tubers should be dried in the sun for several hours, then moved to a well-ventilated spot and keep them at 85F-90F for 10-15 days. After they are cured, store at aournd 55F with humidity of 75-80 percent. Properly cured and stored sweet potatoes will keep for several months.
If stored tubers sprout, they've been kept at too warm a temperature.
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