Potatoes grow underground on a special stem called a 'stolon'. The potato stems above ground have attractive but non-edible flowers. Since the 'root' of the potato plant is not really a root but a stem, potatoes are also considered tubers.
How do potatoes form?
As the potato plant grows, its compound leaves manufacture starch that is transferred to the ends of its underground stems (or stolons). The stems thicken to form a few or as many as 20 tubers close to the soil surface. The number of tubers that actually reach maturity depends on available moisture and soil nutrients.
What happens if you plant a whole potato?
While whole or sections of seed potatoes can be planted right after cutting, allowing time for the cut sides to dry creates a protective barrier that may guard against organisms that could cause the potatoes to rot.
Can you regrow a potato from a potato?
How to grow: To regrow a potato from another one, wait for your potato to grow "eyes" (whitish shoots), and plant a piece of that potato in a pot with soil. Within two weeks, your old potato should transform into green shoots. A few months after that, new potatoes will start forming below ground.
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