Answer: When potato plants flower it indicates that tubers are beginning to develop underground, and that's a good thing. You can begin harvesting potatoes anytime after the plants flower, but the longer you wait, the larger the tubers will grow. The flowers eventually develop into seedpods, which have no particular use, other than to protect the seeds inside. The fruits are not edible. Some potato varieties seem more prone to flowering than others. Potatoes and tomatoes are members of the same (nightshade) family which is why you'll notice a similarity in leaf shape, flowers and fruits. Only the tomato fruit is edible, though!
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