When I was kid we used to have a plum tree in our backyard that was apparently put there a few years before we moved to the house by some college class. It was just one tree, but produced two different types (and colors) of plums.

>http://www.businessinsider.com/tom-tato-grows-potatoes-and-tomatoes-2013-9
>
>http://www.stuff.co.nz/nelson-mail/features/lifestyle/9218071/Potato-Tom-opens-fresh-doors