This is true! Japanese farmers have been doing this for some time using tempered glass cubes while the watermelon is still in the ground. This is beautiful!
How often do you go to a cookout and bring the watermelon? Grab a bow and make it look like a gift.
I’ve seen these in photos but never in person… cool idea.
See how to do it here, http://www.instructables.com/id/Grow-a-square-watermelon/