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According to the folks atAccording to the folks at Idaho Univ, there's not a causal relationship between tuber development and flowering. Potatoes need moderate amounts of nitrogen and cool nights for good tuber growth. In fact, some potato varieties go without flowering and still yield a good harvest. If flowers don't come, we'd advise that you wait at least a week before the plant dies off before harvesting for storage potatoes.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?