This flint corn is mostly grown for decoration, but may be ground to make corn, meal or be popped conventionally. The piece on top of this model was microwaved briefly to show what happens when you do. There is much to know and fun to grow. This video tells about heirloom and popcorn varieties
https://www.youtube.com/watch?v=4bIZYsIDMBI
model from 94 images in 00h:51m:51s.