Sweet potatoes cannot be stored the same way as Irish potatoes. Sweet potatoes DO NOT like getting a chill. First thing to do after harvesting is let them cure in an area which is warm (like 80 plus degrees) and rather humid for about a week to ten days. After this time curing, keep them in a cool (about 55 degrees) and dry (ie low humidity) room. They should keep several months when treated this way, depending upon the variety. We grow sweets every year and do not have a problem storing them through the winter. Very small sweet potatoes will usually shrivel up from losing moisture and should be used fairly quickly. Larger ones, like in your pics will keep for quite a while if done right.
You do of course need to dig them BEFORE frost, or the injury to the foliage will transmit to the roots and they will spoil easily and taste dreadful. Just ask me how I know! LOL!
In the late winter or early spring they will start to try to sprout. You can set some in a warm area under some kind of a grow light (we use fluorescent lights suspended just above the plants) and let the sprouts grow. Don't put them on the windowsill if it is chilly outside. Even if it is warm in the sun, they will be harmed by any chilly drafts. Again, BTDT. If you set them in a basin of water so that the water comes up a little way on the sprouts, they will develop roots and be ready to snap off and plant out. It takes a couple of months from setting them to sprout until they get big enough to plant, so start early. By the way, those sprouts, unlike irish potatoes, are completely edible.
I hope this helps. I googled up a quick link about storing them, if you like.
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