who is on first? Confusion?

 The article's title promised to tell you how to grow potatoes.  Here's the photo they used to illustrate the article which compounded the confusion. OK all you sharp eyed plant people see the confusion right away because this is obviously a sweet potato, not a potato.  This is mostly a storage root but it is a stem at one end (as is obvious).  This is Ipomea batatas, a morning glory, and note the specific epithet, which sounds as if a young kid was saying "potatoes", a common name that got transferred to storage stem (a tuber) in the nightshade family Solanum tuberosum.  Both from Peru.  The common name got switched leading to much confusion.  And don't even think about bringing up the name yam.  The article was about the latter and did not mention sweet potatoes.