You done good. Although, the sweet potatoes probably will keep
longer if you interleave them with newspaper, straw, or some other
absorbant, wicking, material so the sweet potatoes do not touch each
other. As they age, the sweet potatoes will get sweeter and the flavor
willl intensify somewhat. Properly "cured" sweet potatoes will hold
for up to two years if properly stored in the dark, not touching each
other, at temperatures between freezing and 80-85° (F). I just keep
mine in in boxes, interleaved with newspaper or wheat straw in my not
air-conditioned Florida home.
The secrets to long-term storage are proper curing immediately
after digging and keeping them from touching one another in the
storage container. IME, sweet potatoes are most likely to begin
rotting at the point(s) of contact. "Curing" is nothing more than
leaving the sweet potatoes exposed to circulating air at temperatures
of 80-100° (F) for a period of from a couple of days to about a week.
This process allows the skin to dry and become thicker and somewhat
leathery in texture. For best results, do _not_ wash the sweet
potatoes; instead, after they're cured, simply brush off residual
Gratuitous Aside: My late father, born in 1910, lived his early life
in the rural U.S. South (central Georgia) where and when sweet
potatoes were a year-around staple for man and livestock. They were
stored among pine straw in earthen pits ranging from four to six feet
deep. In later years, when reminiscing about the bad old days, he
often joked that the swine got the best sweet potatoes because, when
the folks would refurbish a pit to accomodate a new crop, the hogs got
the remainder potatoes which, by then, would have fully developed in
flavor and sweetness.
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