You need a piece of potato with that least 2 eyes, after cutting the potato in sections it really should set out and dry a bit or dust it with sulfur, you cannot grow potato plants from just a sprout you really need a piece of potato attached. After planting your potato, once it's about 3 to 4 in. tall start piling dirt up around the stem (I usually dig the hole and slowly fill in as the potato grows.)
Now the sweet potato is a totally different thing you have to wait for them to sprout, once the sprouts are at least 3 in. long carefully snap off put it in small glass with a little bit of water once roots form that's when you plant them.
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