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A long while ago, I planted what I'm pretty sure was the head of a sweet potato that started growing.

The plant is still small but growing, and it has some small fruit-beginning (all green, but one which is red), but it really doesn't seems like it's going to be a sweet potato or something similar. It looks more like a tiny cherry tomato.

So, is it a sweet potato plant, or something else jumped into my pot? If so, what it is?

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    Potato and tomato are family, but be careful the fruits of potato plants are poisonous. Solanaceae – benn Jul 4 '18 at 9:00
  • So since their are relatives, it still can be the potato, and it will take that form in a later stage? Or this fruit is something else and not going to develop to a sweet potato? – arieljannai Jul 4 '18 at 9:16
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    Note both tomatoes and potatoes are of Genus Solanum (so not just the family). In any case potatoes could flowers and produce fruits. Are you in Europe? To me it seems just a weed of Solanum genus. Do no eat it. Note: Sweet potatoes are of a completely different family (and different flowers). this is not a sweet potato. – Giacomo Catenazzi Jul 4 '18 at 9:30
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    Sweet potatoes are completely different than potatoes. Good call Giacomo. – stormy Jul 4 '18 at 10:25
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    @stormy I am pretty sure deadly nighthade does not have white flowers. It does strike me as being of the nighshade family though. (first-nature.com/flowers/atropa-belladonna.php describes purple flowers for the Deadly Nighshade). I still would not eat any part of the plant unless fully identified), Its not an Eggplant, and I doubt its a tomato. – davidgo Jul 6 '18 at 7:24
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It's common nightshade. It's not considered an edible, in fact, it's toxic.

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    It indeed looks pretty similar, can you please elaborate more about it? How did it grew there? Where can it arrive from? – arieljannai Jul 4 '18 at 18:01
  • Do you mean Solanum nigrum? There are edible varieties of Solanum nigrum (when ripe only), but you'd want to be careful with a wild kind, since they could be either. – Shule Aug 4 '18 at 0:15
  • I do I believe that it looks like a berry in the Solanum genus, though, whether or not it's that specific one. There are different species that look pretty similar. – Shule Aug 4 '18 at 0:16
  • Solanum ptychanthum is called Common Nightshade. Is that what you mean? Solanum americanum? – Shule Aug 4 '18 at 0:23

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